The War of 1812, the Mexican-American War, the Spanish-American War, World War I and World War II
The Vietnam War was not declared by Congress. It was started when the President sent troops.
cold war
Some believed that wars could not be fought unless they were "Declared Wars." However, Vietnam nor the US Civil War were declared wars.
5 War of 1812 Mexican-American War Spanish-American War World War I World War II
Congress declared war in 1812 against Britain, in 1846 against Mexico, in 1898 against Spain, in 1917 against Germany, and in 1941 against Japan, Germany, and Italy.
Congress declares wars, some examples of US declared wars: 1. Mexican War (1846-1848) 2. Spanish-American War (1898) 3. WWI (1917-1918) 4. WWII (1941-1945)
The Vietnam War and The Civil War
The last time the US congress declared war was in 1941, when the US entered WW II following the attack on Pearl Harbor.
To date, there have been no US declared wars in the atomic age. The last declared war was WW2; before the atom bomb was invented.
The Pennselvaina congress.
Congress declared war 5 times
Only 5 that were formally declared per the requirements of the US constitution, the most recent being WW2.