1

The Boston Tea Party (1773)

The political unrest that eventually led to the American Revolutionary War was brewing well before the Boston Tea Party of 1773, but things might have gone a different way had this event not happened. The destruction of the East India Company’s tea by the Sons of Liberty as a protest against taxation was seen as a direct act of defiance by the British Parliament , who retaliated by closing the Boston Port, intervening in the Massachusetts colonial government, and stationing troops in private residences. This was seen as an act of war by the colonists, and it accelerated the gathering of the First Continental Congress and the start of the American Revolution.

2

The Crossing of the Delaware (1776)

By December 1776, the Continental Army was on the brink of defeat after a series of losses. The soldiers’ morale was low, and most enlistments were set to expire by the new year. The British had decided to hunker down for the winter season, instead of chasing the colonists, and General George Washington knew he had to act fast. On the night of December 25th, he led 2,400 across the icy Delaware River in the midst of a blizzard, hoping to catch the British forces garrisoned at Trenton by surprise. The attack was successful, and it was the first of a series of victories that uplifted the revolutionaries’ morale and changed the course of the war.

3

The Whiskey Rebellion (1791)

In 1791, the newly formed American government levied its first federal tax on whiskey, with the intention of using the revenue to pay war debts. However, this was met with strong resistance, protests, and even armed insurrection in the state of Pennsylvania. The peaceful suppression of the rebellion not only prevented further conflicts but also cemented the authority of the federal government over the states in matters of taxation. The role of the army led by Washington himself was crucial in the creation of a standing army—strongly opposed by many founding fathers—and it was the origin of the American military as one of the world's strongest.

4

The Bill of Rights (1791)

The original U.S. Constitution was met with strong opposition by many states, who saw it as infringing on individual rights and liberties, and as a possible source of government tyranny. A Bill of Rights, establishing and securing fundamental freedoms, was drafted and added as a condition for the ratification of the document. While this compromise was crucial for establishing the bases of the American nation, it also put into practice the mechanism for amending the Constitution, codified in Article V, and set the precedent that the supreme law of the land could evolve with the nation.

5

The Louisiana Purchase (1803)

Thomas Jefferson’s purchase of Louisiana from the French in 1803 was much more than a simple territorial acquisition. The 828,000 square miles territory, purchased for roughly 15 million dollars, doubled the size of America, now expanding its initial borders from the Mississippi to the Rocky Mountains. By securing the Mississippi River and the port of New Orleans, the U.S. expanded its agricultural economy and gained access to vast natural resources , while the control over a former French territory diminished the influence of European powers—mainly, the rising Napoleon Bonaparte— in North America. The soon-to-follow Westward expansion would add 13 new states to the Union.

6

The Battle of San Jacinto (1836)

Given its significance in Texan and American history, it is easy to forget that the 1836 Battle of San Jacinto lasted a mere 18 minutes. After the victory of the Mexican army at the Alamo and the massacre of war prisoners in Goliad, Texan morale was low, and the quest for Texas’ independence was nearly ended. Pursuing the remnants of the army led by Sam Houston, Mexican scouts incorrectly reported the route taken by the Texans, which allowed Houston to evade the enemy. After blocking the escape route and while the Mexican soldiers were taking a nap, 900 Texan soldiers attacked by surprise, killing more than half of the Mexican forces (around 1,300 men) and capturing the rest.

7

The Battle of Antietam (1862)

Widely considered to be the bloodiest battle of the American Civil War, with a tally of 22,726 casualties between dead, wounded, and missing people, the 1862 Battle of Antietam ultimately tipped the balance in the Union’s favor. But did you know that the casualties could have been far less? As the Union Army of the Potomac was moving to intercept the Confederate forces of General Lee, two Union soldiers came across a copy of Lee’s battle plans, detailing his intention of dividing the troops , which would allow the Union forces to isolate and defeat the Confederate army. However, Union General McClellan waited 18 hours before deciding to attack, which gave Lee the time to mount a strong defense in Antietam.

8

The New Deal (1932)

Burdened by the consequences of the Great Depression, Americans overwhelmingly supported the election of Franklin D. Roosevelt as president in 1932. Roosevelt’s main campaign promise, the New Deal, involved a series of economic, social, and political reforms to combat America’s economic crisis and restore the country’s trust in the government. The reforms weren’t entirely successful in ending the Great Depression —it only fully ended with the industrial mobilization for World War II— but they were key to ensuring that America would not suffer such a crisis again by establishing structural changes, relief programs, social security, and safety nets, regulating financial institutions, and ultimately showing American citizens that the government was working to help them.

9

The Cuban Missile Crisis (1962)

There were several moments during the Cold War Era (1947-1991) when the world thought a nuclear war was imminent, but none as close to it as the Cuban Missile Crisis. In October 1962, the Soviet government deployed nuclear missiles in Cuba as a response to similar deployments made by the U.S. in the UK, Italy, and Turkey. A 13-day crisis ensued, with President Kennedy ordering a naval blockade in Cuba, while his advisors pushed for an air strike and an all-out invasion. While the conflict ended peacefully, the nuclear war had been closer than most imagined: a U.S. Navy ship in the blockade had dropped signaling charges to deter a Soviet submarine, not knowing the submarine carried a nuclear torpedo. The Soviet captain assumed war had started and prepared to attack the ship, but he had to wait for confirmation. Luckily, the attack never happened, and a nuclear war was avoided.

10

The March on Washington (1963)

In 1963, at the height of the civil rights movement, social tensions were at an all-time high. Violent confrontations had happened in marches across the country, usually as a result of attacks on peaceful protesters. Still, these incidents had fueled the narrative of Civil Rights activists as violent and dangerous. As President Kennedy announced his intention to push for civil rights legislation, several organizations and leaders came together to organize the ‘March on Washington for Jobs and Freedom’. The march took place on August 28, 1963, and it's considered to have been one of the largest human rights rallies in American history, with an attendance of around 250,000 people. Besides landmark moments—such as MLK’s "I have a dream" speech— the march was crucial in showing peaceful protest and in pressuring the government to advance in what would later become the Civil Rights Act of 1964 and Voting Rights Act of 1965.

1

What are bills made of?

Unlike other currencies, dollar bills are not made of paper or plastic. U.S. dollar bills are made from a special fabric blend composed of 75% cotton and 25% linen. This mix makes the bills extremely durable and resistant, and they can be folded about 4000 times before tearing.

2

What bills are valid?

Any U.S. dollar bill that was legally printed is valid, no matter how old, as American currency does not have an expiration date. While some bills might not be accepted by businesses of foreign exchange services due to their condition or if they are a discontinued version of the bill, the bills themselves are still valid, and American banks will accept them, though they might take them out of circulation.

3

American leaders

Five bills have a depiction of an American president. The exceptions are the $10 bill, with Alexander Hamilton on the front, and the $100 bill, with Benjamin Franklin. The $1 bill, depicting George Washington, is extremely symbolic: several elements are repeated 13 times as a nod to the thirteen colonies, and it showcases the Bald Eagle and the Eye of Providence as a sign of God watching over America.

4

A change in size

Did you know that dollar bills used to be so big that they were nicknamed "horse blankets"? Original dollar bills were 7.4 × 3.1 inches. In 1929, the Treasury Department reduced the size of bills to 6.14 × 2.61 inches to reduce production costs and materials. Old bills, though still valid, are worth much more as collector items.

5

Uniformity

Besides their value and design, all dollar bills have the same size (6.14 × 2.61 inches), color, and weight (1 gram) , which sets American currency apart from other countries where bills of different values are differentiated by size, color, or both. Why doesn’t the U.S. implement differences among bills? The cost of adapting vending machines, bank drawers, and ATMs to new bill sizes would cost billions of dollars.

6

Hard to copy

Originally, dollars were not green, but black. As time passed, green ink was favored, as it was cheap and did not fade as much as black. The new color also prevented people from using black-and-white cameras to create counterfeit money. Currently, dollar bills are predominantly green, but newer versions also include extra colors, such as pink, orange, or purple.

7

A $100,000 bill?

Have you ever seen a $500 or 1,000 dollar bill? What about a $100,000? Up until 1945, the U.S. Treasury printed $500, $1,000, $5,000, $10,000, and $100,000 notes , in addition to the values currently in use. These higher-value notes were mainly intended for bank and government use, but were sought by criminals as they made it easier to hide large amounts of money. Even though they were officially discontinued in 1969, these notes are still valid, though rare, and they have a high worth as collector's items.

8

No numbers

Unlike bills, American coins have different sizes and colors related to their value. Originally, gold, silver, and copper were used for coins, but modern coins are made of copper, zinc, or nickel. Besides their size and design, the value of each coin is printed in letters, not in numbers , alongside depictions of American presidents.

9

Liberty for all (the coins)

By law, all American coins must include six specific details : the word ‘Liberty’, the name of our country, the national motto "In God We Trust", the oldest American motto "E Pluribus Unum", the value of the coin, and the year. Each coin also includes a mint mark that shows where it was made: "P" for Philadelphia, "D" for Denver, "S" for San Francisco, and "W" for West Point.

10

A global currency

The American dollar is one of the most powerful currencies in the world, acting as a backbone for international trade and finances. It is estimated that two-thirds of the physical dollars in circulation are outside American territory. Besides the U.S. and its territories, eight sovereign nations have the U.S. dollar as their official currency, with several more accepting it as legal tender.

1

There's an unexplained billion-year gap

Look closely at the canyon walls, and you'll notice something strange: a clean, sharp line where ancient rock simply stops, and a much younger layer begins directly above it.

This geological puzzle is called the "Great Unconformity," and it represents over a billion years of rock layers that are simply absent , as though that stretch of time never happened. In some spots, rock dated 1.8 billion years old sits directly beneath rock that is only 520 million years old. Where did the missing billion years go?

The leading theory involves the violent breakup of an ancient supercontinent, but scientists are still piecing it together.

2

During the Cold War, it hid a nuclear fallout shelter

During the Cuban Missile Crisis in 1962, the U.S. government converted part of the Grand Canyon Caverns into a fallout shelter. This dry cave system, more than 200 feet underground, was stocked with enough food and water to sustain 2,000 people. Naturally, it was never occupied, and the supplies were never used.

The caverns have since been transformed into a tourist attraction, with organized tours winding through the same underground chambers that were once intended as a refuge from nuclear war. You can even book a night's stay there.

3

The Federal Aviation Administration was founded after a crash over the canyon

In 1956, two commercial passenger planes collided in midair over the eastern Grand Canyon, killing all 128 people on board both crafts. Rescue teams struggled to reach the wreckage deep inside the canyon, and the extreme heat of the crash had caused the planes' aluminum to fuse with the bedrock. There were no survivors.

The disaster exposed a terrifying truth: the U.S. air traffic control system was dangerously outdated, relying on pilots' visual estimates and rough guesswork from controllers , with no way to separate fast-moving aircraft from slow ones, or instrument-flying planes from those navigating by sight. Congress responded by passing legislation that created both the Federal Aviation Administration (FAA) and the National Transportation Safety Board.

4

A hoax suggested that an Egyptian civilization had lived there

In 1909, the Arizona Gazette reported that an explorer named G. E. Kinkaid had discovered a vast underground citadel inside the canyon, filled with artifacts linked to ancient Egyptian civilization. He even claimed the expedition had been funded by the Smithsonian.

This story described hieroglyphics on the walls, mummies in the chambers, and relics pointing to a direct connection with the Egypt of the pharaohs. It was incredibly detailed, and it was, of course, a hoax. No evidence for any of Kinkaid's claims ever surfaced.

5

Fewer than 100 people have ever hiked its full length

Among the few people who have completed the through-hike of the Grand Canyon is Jen Hogan, the first woman to accomplish it, finishing her journey in 2021–2022.

It’s a full 800-mile length below the rim. The route involves extreme heat, flash floods, near-impassable areas, and stretches with no water or trail whatsoever. Around 60 or 70 people have reportedly accomplished it. This makes it one of the most exclusive feats on Earth.

6

The Grand Canyon's rocks predate dinosaurs entirely

Visitors scanning the canyon walls for fossils are often surprised to learn they won't find any dinosaur bones here. The rock layers of the Grand Canyon are simply older than dinosaurs. This fact alone can be shocking: staring at its walls means staring at marine fossils from as far back as 1.2 billion years ago. Some of its caves hold the remains of ancient mammals. The canyon is a window into a world that existed long before the dinosaurs, when the land that is now Arizona lay beneath a shallow sea.

7

The park is bigger than Rhode Island

Numbers alone rarely capture the Grand Canyon's scale, so here's a different approach. Rhode Island covers about 1,214 square miles, and the Grand Canyon National Park spans 1,904 square miles.

The canyon's depth exceeds four Empire State Buildings (which is 1,454 feet) stacked on top of one another. That’s 6,093 feet at its deepest point.

8

But it's not the deepest canyon on Earth

For all its grandeur, the Grand Canyon does not hold the depth record. Pictured above, the Yarlung Tsangpo Grand Canyon in Tibet, China, plunges to 17,567 feet, which is nearly three times deeper. Carved by the Yarlung Tsangpo River as it cuts through the eastern Himalayas, that canyon is so remote and extreme that it remained largely uncharted until the late 20th century.

9

It is home to a pink rattlesnake found nowhere else on Earth

The Grand Canyon Pink Rattlesnake has a pinkish-red coloring that matches the canyon's own distinctive rock walls so closely that it's nearly invisible. It is found nowhere else in the world. Officially classified as Crotalus oreganus abyssus , it has darker diamond-shaped markings along its back that deepen the camouflage further.

10

There's a village at the bottom: Supai Village

For over 1,000 years, the remote village of Supai has been home to the Havasupai Tribe, the People of the Blue-Green Waters. It is located an eight-mile hike from the rim, but sits roughly 3,000 feet deep inside the Grand Canyon.

The U.S. Department of Agriculture has called it the most remote community in the contiguous United States, and it has no automobiles and no road access. The only ways in are on foot, by mule, or by helicopter. It is also the only place in the United States where the postal service still delivers mail by mule train.