The Spanish-American War of 1898, lasted about 5 months.
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The longest war the United States ever entered was the Vietnam War.
The XYZ affair between the US and France resulted in an undeclared war known as the Quasi-War. The war was fought mostly at sea between 1798 and 1800. Britain and the Batavian Republic allied with the US against the French Republic and Spain.
Us fought against Italy, Germany and Japan.
The last declared US war was WW2.
For War against Japan the vote was 388 - 1. For War against Germany the vote was 393 - 0. For War against Italy the vote was 399 - 0.