U.S. Imperialism in the Early 20th Century

The United States purchased Hawaii from Russia in the early 20th century.

The Philippines declared independence from the United States after the Spanish-American War.

The U.S. acquired Puerto Rico and Guam from Colombia after the Spanish-American War.

The Panama Canal was built to connect the Atlantic and Pacific Oceans through the United States.

The U.S. currently owns 50 overseas territories, including Puerto Rico, Guam, and the U.S. Virgin Islands.

The U.S. went to war with Spain to avenge the sinking of the USS Maine, which was proven to be caused by Spain.

The assassination of Austrian-Hungarian Archduke Franz Ferdinand was the only cause of World War I.

The United States initially joined World War I in response to Germany's invasion of Belgium.

Russia experienced a transition to communism during World War II.

The Treaty of Versailles forced the Allied Powers to accept responsibility for the war and pay damages to Germany.

The Allies took control of the former German Empire, leading to many of the current political issues in Europe today.

America's involvement in World War I lasted for four years, from 1914 to 1918.