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The Gold Standard Act of the Unites States was passed in 1900  and established gold as the only standard for redeeming paper money, stopping bimetallism . It was signed by President William McKinley.

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Theodore Roosevelt becomes president (1901) 

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Theodore Roosevelt becomes president (1901) 

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The Presidency of Theodore Roosevelt began on September 14, 1901, when Theodore Roosevelt became the 26th President of the Unites States. This was after the assassination and death of president William McKinley. Roosevelt had been the Vice President of the United States for only 194 days when he succeeded to the presidency.

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The United States commenced building a canal across a 50-mile stretch of the Panama isthmus in 1904. The project was helped by the elimination of disease-carrying mosquitoes, while chief engineer John Stevens devised innovative techniques .

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The Sixteenth Amendment  to the United States Constitution allows Congress to levy an income tax without apportioning it among the states. The Sixteenth Amendment was ratified on February 3, 1913, and effectively overruled the Supreme Court's ruling in Pollock.

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The amended Joint Resolution was adopted by the Senate on a close vote in May of 1911. Over a year later, the House accepted the change, and the amendment was sent to the states for ratification. On April 8, 1913, three-quarters of the states had ratified the proposed amendment, and it was officially included as the 17th Amendment.

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World War I began in 1914 after the assassination of Archduke Franz Ferdinand and lasted until 1918. During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States (the Allied Powers).

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A German U-boat torpedoed and sank the RMS Lusitania, a British ocean liner en route from New York to Liverpool, England. There were 1,900 passengers and crew members on board, and more than 1,100 perished, including more than 120 Americans.

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The Sussex Pledge was a promise made by Germany to the United States in 1916. Early in 1915, Germany had instituted a policy of unrestricted submarine warfare, allowing armed merchant ships, but not passenger ships, to be torpedoed without warning. Despite this restriction,  the Sussex, was torpedoed without warning on March 24, 1916 the ship was severely damaged and about 50 people died.

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The Treaty of Versailles was signed in June 1919  at the end of WWI. The Treaty of Versailles held Germany responsible for starting the war and caused loss of territory, massive reparations payments and demilitarization.

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The 19th Amendment to the U.S. Constitution granted American women the right to vote, a right known as women’s suffrage, and was ratified on August 18, 1920, ending almost a century of protest.