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Separated by vast gulfs of political, cultural, and philosophical divergence, the three chief Allied nations of World War II - the United States, the Soviet Union, and Great Britain - attempted to formulate a joint policy through a series of three conferences during and immediately after the conflict.

Shortly after World War II, Congress' House Committee on Un-American Activities began investigating Americans across the country for suspected ties to communism.

For much of the 20th century, South American governments in large part lived under a system of military junta governments. The mixture of indigenous peoples, foreign settlers and European colonial superpowers produced cultural and social imbalances into which military forces intervened as a stabilizing influence. The proactive personalities of military heads and the rigid structures of such a hierarchy guaranteed the "strong man" commanding officer an abiding presence in the form of executive dictator.

Separated by vast gulfs of political, cultural, and philosophical divergence, the three chief Allied nations of World War II - the United States, the Soviet Union, and Great Britain - attempted to formulate a joint policy through a series of three conferences during and immediately after the conflict. The second meeting, named the Yalta Conference after its Black Sea venue, occurred in February 1945 and was both the most well-known and most influential of them all.

By the early decades of the 20th century, the fur trade had tapered off some from its heyday in the 19th century, but it still proved profitable enough for hunters to live for months at a time in remote regions of Alaska. Their only contact with the outside world consisted of the company ships that came to buy their furs and bring them supplies. One of these vessels was the steamer Baychimo, a Hudson's Bay Company ship that plied the treacherous waters off Alaska, Arctic Canada, and Siberia for many years.

There is a popular saying that claims timing is everything, and in no other field of study is that truer than in history. For instance, under normal conditions, a ship that sank with more than 1,000 passengers aboard - most of whom died - would be big news, yet today the sinking of the PS General Slocum is often overlooked if not entirely forgotten.

Separated by vast gulfs of political, cultural, and philosophical divergence, the three chief Allied nations of World War II - the United States, the Soviet Union, and Great Britain - attempted to formulate a joint policy through a series of three conferences during and immediately after the conflict. The first meeting took place in Tehran in late 1943, while the fate of World War II still hung in the balance. The fate of World War II hung in the balance in 1943.

World War II was fought on a scale unlike anything before or since in human history, and the unfathomable casualty counts are attributable in large measure to the carnage inflicted between Nazi Germany and the Soviet Union during Hitler's invasion of Russia and Stalin's desperate defense. The invasion came in 1941 following a nonaggression pact signed between the two in 1939, which allowed Hitler to focus his attention on the west without having to worry about an attack from the eastern front.

In the warm predawn darkness of June 22, 1941, three million men waited along a front hundreds of miles long, stretching from the Baltic coast of Poland to the Balkans. Ahead of them in the darkness lay the Soviet Union, its border guarded by millions of Red Army troops echeloned deep throughout the huge spaces of Russia.

Though scarcely mentioned in the world of early 21st century politics, Manchuria represented a key region of Asia during the first half of the 20th century. Once the heartland of the fierce Manchu empire, this northeastern Chinese region's rich natural resources made it a prize for nations in the process of entering the modern age, and three ambitious nations in the midst of such a transformation lay close enough to Manchuria to attempt to claim it: Japan, Russia, and China.

During the first half of 1944, the Americans and British commenced a massive buildup of men and resources in the United Kingdom, while Allied Supreme Commander Dwight D. Eisenhower and military brass planned the details of an enormous and complex amphibious invasion of Europe. The most obvious place for an invasion was just across the narrow English Channel, and the Germans had built coastal fortifications throughout France to protect against just such an invasion.

Margeretha Geertruida Zelle, better known to history by the exotic, glamorous name of Mata Hari, was a woman who profited greatly from the power of illusion during much of her brief life. Born to a hatter named Adam Zelle and his wife Antje van der Meulen, Mata Hari moved from a financially rewarding but miserable marriage to circus performances to exotic dancing and celebrity to the role of ostensible international spy in an arc that ended tragically in front of a French firing squad.

Germany's North African defeat opened up the possibility of taking the war in the west to the European continent for the first time since France's lightning conquest by the Wehrmacht in 1940. The British and Americans debated the merits of landing in France directly in 1943, but they ultimately opted against it.

As much as it is a center of power, 10 Downing Street is also a study in contradictions. Though known today as the home of the prime minister, for most of its history it has housed other high-ranking government offices. Seen as a symbol of stability, it has often been physically the opposite; originally built in a swamp on a sandy foundation, it was shorn up again and again for decades. In fact its location and condition were often considered so bad that prior to 1900, only about half of the men offered the home chose to live there.

On Christmas Day 1914, amid the bloodily stalemated trenches of Flanders just five months into World War I, a memorable event dubbed the Christmas Truce occurred. In place of the rattle of gunfire and the crash of bursting artillery shells, familiar German and English Christmas carols floated through the frosty air. Officers and men on both sides emerged from their trenches to mingle, exchange Yuletide greetings, give one another small gifts and mementos, and discuss the fighting as language allowed.

Standing in history like a milestone marking the boundary between one era and the next, the Potsdam Conference brought together the leaders of the three major Allied powers - the United States, the Soviet Union, and the United Kingdom - for the last time at the end of World War II and at the threshold of the Cold War. A follow up to the Yalta Conference just five months earlier, Potsdam attempted to work out the contours of the postwar world.

The first aircraft to appear in the skies over the battlefields of World War I showed few signs of the dominant future of airplanes in warfare. Small, fragile, and slow, they provided no hint of the sleek jet fighters that would one day slash across the skies of Earth faster than sound to unleash the lethal blast and fire of sophisticated missiles, or the bombers able to level an entire city with one nuclear bomb. That said, they did not represent a complete novelty in warfare either, at least not during the early months of World War I.

Cloak and dagger adventure, with daring commandos parachuted deep behind enemy lines to kill a sinister mastermind, belongs chiefly to the realm of thriller novels or films.

World War I, also known in its time as the "Great War" or the "War to End all Wars", was an unprecedented bloodbath in terms of its sheer scale.

Just before midnight on April 14, 1912, the RMS Titanic, the largest ship in the world, hit an iceberg, setting in motion a chain of events that would ultimately make it history's most famous, and notorious, ship. In the century since it sank on its maiden voyage, the Titanic has been the subject of endless fascination, as evidenced by the efforts to find its final resting spot, the museums full of its objects, and the countless books, documentaries, and movies made about the doomed ocean liner.