World War I was the deadliest conflict until that point in human history, claiming tens of millions of casualties on all sides.
Under President Woodrow Wilson, the United States remained neutral until 1917 and then entered the war on the side of the Allied powers (the United Kingdom, France, and Russia).
The experience of World War I had a major impact on US domestic politics, culture, and society. Women achieved the right to vote, while other groups of American citizens were subject to systematic repression.
War in Europe and US neutrality
On June 28, 1914, Yugoslav nationalist Gavrilo Princip assassinated the heir to the throne of the Austro-Hungarian empire, Archduke Franz Ferdinand. Princip and his accomplices wanted to unite the Yugoslav people and liberate them from Austrian rule. The assassination set off a series of events that culminated in a declaration of war between Austria-Hungary and Serbia. Due to the European alliance system, all major European powers were drawn into the war, which spread around the globe and became the first world war in human history.
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