United States Enters the Great War

American Empire

North America 1917.0406

United States Enters the Great War

The Spanish-American War, the Banana Wars, the Mexican Revolution, World War I and the Great Depression (6 April 1917)

Historical Map of North America & the Caribbean

While the US was embroiled in Latin America, the Great War had erupted across Europe, pitting the German-led Central Powers against France, Britain and Russia and their allies. At first the US was neutral, but gradually it came to see Germany as the greater threat. Germany's 1917 announcement of unrestricted submarine warfare in an attempt to starve Britain into surrender further aggravated its relations with the US and, when German plans to incite a war between Mexico and the US were uncovered, America declared war.

Main Events

US invades Dominican Republic

United States intervenes in Dominican Republic to overthrow recent coup-leader Desiderio Arias and maintain order

Treaty of the Danish West Indies

After a series of negotiations for the purchase of the Danish West Indies - which had begun for some islands as early as 1867 - the United States signed the Treaty of the Danish West Indies with Denmark on 4 August 1916, agreeing to purchase the islands for a sum of US$25,000,000 in gold. After ratifications were exchanged on 17 January 1917, and the US presented the money on 31 March, the islands were formally transferred to the US, becoming the US Virgin Islands.

Germany announces resumption of unrestricted submarine warfare

Zimmermann Telegram made public in United States

February Revolution

Mass demonstrations broke out in Petrograd, capital of the Russian Empire, in March (late February in the Julian calendar) in response to economic and social problems, compounded by the strain of World War I. After a few days, the mutinous Russian Army sided with the revolutionaries, forcing Tsar Nicholas II to abdicate in favor of a Provisional Government under Prince Georgy Lvov.

US declaration of war on Germany

On 2 April 1917, United States President Woodrow Wilson asked a special joint session of the US Congress to declare war on the German Empire. Congress obliged by declaring war on the 6th, with the resolution passing 82 to 6 in the Senate and 373 to 50 in the House.

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