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It was Constantine the Great who first decided that Rome, exposed and vulnerable near the gathering masses of barbarians moving into Germania and Gaul in the early 4th century, was a strategically unsafe base for the empire, and thus expanded the city of New Rome on the Dardanelles straits, creating what eventually became Constantinople.

Since the Battle of the Little Bighorn, George Armstrong Custer has possessed one of the most unique places in American history. Although he was a capable cavalry officer who served honorably during the Civil War, he remains one of the most instantly identifiable and famous military men in American history due to the fact he was killed during one of the country's most well-known and ignominious defeats: the Battle of Little Bighorn.

In October 1962, American spy planes discovered the Soviets were building nuclear missile sites in Cuba, and intelligence officials informed President John F. Kennedy of this on October 16th. It went without saying that nuclear missile sites located just miles off the coast of the American mainland posed a grave threat to the country, especially because missiles launched from Cuba would reach their targets in mere minutes. That would throw off important military balances in nuclear arms and locations that had previously ensured the Cold War stayed cold.

By the second century CE, Londinium was a large Roman city, with tens of thousands of inhabitants using villas, palaces, a forum, temples, and baths. The Roman governor ruled from the city in a basilica that served as the seat of government. What was once a 30 acre outpost now spanned 300 acres and was home to nearly 15,000 people, including Roman soldiers, officials and foreign merchants.

During the first half of the 1st millennium CE, an empire arose in Persia that extended its power and influence to Mesopotamia in the east, Arabia in the south, the Caucasus Mountains in the north, and as far east as India. This empire, known alternatively as the Sasanian Empire or Sassanid Empire, was the last of three great dynasties in Persia—the Achaemenid and the Parthian being the first two dynasties—before the rise of Islam.

Scientists have long attempted to understand Earth’s past, and in service to that effort, they have divided the world’s history into eons, eras, periods, epochs, and ages. The Triassic Period: The History and Legacy of the Geologic Era that Witnessed the Rise of Dinosaurs looks at the development of the era, the extinction events that preceded it, and how dinosaurs began to evolve in the Late Triassic. You will learn about the Triassic Period like never before.

During the Late Bronze Age, from about 1500-1200 BCE, the Near East was a time and place where great kingdoms and empires vied for land and influence, playing high stakes diplomatic games, trading, and occasionally going to war with each other in the process. The Egyptians, Hittites, Babylonians, Assyrians, and several smaller Canaanite kingdoms were all part of this system, which was one of the first true “global” systems in world history and also one of the most materially prosperous eras in antiquity.

Conspiracy theories, and particularly the belief that elements of the world are secretly controlled by individuals or groups, have been around for as long as people have lived in groups. Perhaps that’s inevitable—after all, those who are excluded from power are very likely to be inclined to see their position not as an outcome of their own choices or situation but because of the secret machinations of shadowy groups. One of the most widely discussed conspiracy theories concerns what has become known as the New World Order.

Though they are not as well known as tribes like the Sioux or Cherokee, the Creek are one of the oldest and most important Native American tribes in North America. With roots that tie them to the Ancient Moundbuilders, the Creek were one of the most established groups in the Southeastern United States, and came to be known as one of the Five Civilized Tribes. It's also believed that the Creek were the first natives encountered by Spanish explorer Hernando De Soto's historic expedition in the mid-16th century.

As a basic definition, it may be said that an Ice Age is simply a period of time during which thick ice sheets cover vast areas of land. These sheets have advanced and retreated, at times taking over the entire planet, and conversely disappearing nearly altogether. Glacial ice formed by this regularly occurring process does not sit in a state of inertia, but moves dynamically, reshaping the geological features of the continents.

Since the early days of human warfare, which may date back to the Stone Age, combatants have sought to gain an advantage through the acquisition of secret information. With the growth of technology, a parallel advantage was sought through the application of numerous types of torture. In the 19th century, the concept of manipulation was added to military tactics, an attempt to influence the minds of assassins, double agents, and world leaders alike to act against their natures.

The Pleistocene spans a period from around 2.5 million years ago (mya) to just over 12,000 years ago, and it was an epoch of enormous change on Earth, mainly characterized by climate changes involving fluctuations between periods of extreme heat and long periods of glaciation. This period is commonly known as the Ice Age, despite the fact there were actually a number of separate periods of cold. The Pleistocene Era: The History of the Ice Age and the Dawn of Modern Humans looks at the development of the era, what life on Earth was like, and the origins of archaic humans.

Today, the name Clint Eastwood conjures up many different and unforgettable images. While many will always associate him as the quintessential Western hero in classics like The Good, the Bad, and the Ugly, new generations know him as a critically acclaimed director and even an outspoken conservative firebrand.

Nikola Tesla was one of history’s greatest scientists, and though he is best known for his pioneering work with electricity, the fact that he is mostly remembered solely for that actually does a disservice to his legacy.

Freedom of the press isn’t just a fundamental right in America but a key part of the democratic process. When the United States secured its independence against Britain in the War of Independence in 1783, there was no certainty about what the new country would look like in terms of national governance. In 1787, delegates from the various states convened in Philadelphia to draft a constitution that would define this.

During the last 100 years, Susan B. Anthony has been one of the most venerated women in American history. In the process of becoming one of the most famous Americans of her era, Anthony’s legacy has overshadowed many of her contemporaries who were also active in the fight for civil rights. Among them, few led as interesting or progressive a life as Dr. Mary Edwards Walker, who grew up in a family that encouraged every kind of pursuit for girls and provided an educational foundation that would propel Walker in many fields.

Set in the northeastern corner of Spain and nestled next to France is the autonomous region of Catalonia. More than seeing themselves as Spaniards, Catalonian people see themselves as Catalan first and foremost, and they all are natively fluent in the language, Catalan. After a tumultuous history during which it bounced back and forth in terms of its political status and relationship to Spain’s central government, Catalonia was granted its autonomy on December 18, 1979. In 2006, it came close to acquiring its total independence, but that status is still being hotly contested.

On Wednesday, March 28, 1979, 36 seconds after the hour of 4:00 a.m., several water pumps stopped working in the unit 2 nuclear power plant on Three Mile Island, 10 miles southeast of Harrisburg, Pennsylvania

In American history, there are few people as controversial or consequential as Nat Turner, who was one of millions of slaves in the South before the Civil War but ultimately led the nation's most notorious slave uprising. In August 1831, Turner led a rebellion that terrorized Virginia for several days, killing dozens of Whites and freeing slaves as his band moved from plantation to plantation.

The narrative of American history is incomplete without the inclusion of the Native Americans that lived on the continent before European settlers arrived in the 16th and 17th centuries. Among these groups, one of the most famous is the Mohawk, who refer to themselves as Kanien'kehá:ka ("People of the Place of Flint"), but pop culture has a very different image in mind when it comes to the Mohawk. Those unfamiliar with the group associate them with the conspicuous Mohawk haircut, and images of a warlike people who scalp their enemies are still evoked.