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US UN-Declared Wars:

1. Revolutionary War (1775-1783)

2. Civil War (1861-1865)

3. Korean War (1950-1953)

4. Vietnam War (1961-1975)

The last declared US war was WWII.

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14y ago
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12y ago

The last time Congress declared war was in World War II, in December, 1941

(on Japan December 8 and on Germany December 11, 1941).

Declared wars included:

The War of 1812 (1812-1814)

The Mexican War (1846-1848)

The Spanish-American War (1898)

World War I (1917-1919)

World War II (1941-1945)

NOTE

The Korean War and the Vietnam War were not declared wars.

The War in Afghanistan, and both Gulf Wars in Iraq have been undeclared.

Both the US Civil War and Revolutionary War were considered acts of Rebellion.

The Quasi-War with France was un undeclared war in 1800.

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13y ago

1. War of 1812

2. Mexican War 1846

3. Spanish-American War 1898

4. WWI 1917

5. WWII was the last time 1941

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12y ago

Only six of the major thirteen wars that this country has fought have followed a formal declaration of war by Congress.

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16y ago

Congress declared war 5 times

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Q: How many times and in what years has the US formally declared war against another country?
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