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The US entered WW1 in 1917. The US entered WW2 in 1941.
The US entered World War 1 on April 6, 1917. The war ended about one and a half years later.
The US entered when it declared war on Germany on April 6th 1917. So they entered late.
During World War I, the major nation which joined the war on the Triple Alliance side in 1917 was the United States. Although poorly prepared on the whole, the United States quickly became a formidable force and contributed significantly in the final victory.
The SS Lusitania was sunk in 1915. The US entered WW1 when Germany resumed "un-restricted" submarine warfare in 1917.