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British passenger liner that sank in the North Atlantic Ocean in 1912 after hitting an iceberg during its maiden voyage.

Amendment to the United States Constitution giving Congress the power to tax income, ratified in 1913.

A man-made 48-mile waterway in Panama that connects the Atlantic Ocean to the Pacific Ocean, opened in 1914.

Global war centered in Europe that began in 1914 and lasted until 1918, also known as the Great War.

The central banking system of the United States, created with the enactment of the Federal Reserve Act in 1913.

Amendment to the United States Constitution establishing the popular election of United States senators by the people of the states, ratified in 1913.

A United States federal law passed on June 15, 1917, during World War I to prohibit interference with military operations or recruitment, to prevent insubordination in the military, and to prevent the support of U.S. enemies during wartime.

A secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the event that the United States entered World War I against Germany.

An extension of the Espionage Act to cover a broader range of offenses, notably speech and the expression of opinion that cast the government or the war effort in a negative light or interfered with the sale of government bonds, passed in 1918.