Congressional War Votes
15 major votes from 1812 to present. Congress has formally declared war only 5 times — but authorized military action many more.
6
Formal Declarations
9
Authorizations / Other
2024
Most Recent
📜 Complete Timeline
Declaration of War — War of 1812
First declared war. Closest war vote in US history. Federalists opposed.
Declaration of War — Mexican-American War
Abraham Lincoln (then a Congressman) challenged Polk's justification with his "Spot Resolutions."
Declaration of War — Spanish-American War
Launched American empire. US gained Philippines, Puerto Rico, Guam, Cuba.
Declaration of War — World War I
Jeannette Rankin (first woman in Congress) voted no. She also voted against WWII — the only member to vote against both.
Declaration of War — World War II (Japan)
Only dissenting vote: Jeannette Rankin (R-MT). "As a woman I can't go to war, and I refuse to send anyone else."
Declaration of War — World War II (Germany)
Unanimous after Pearl Harbor. Last formal declaration of war by the US.
Gulf of Tonkin Resolution
Based on a fabricated attack. Only Wayne Morse (D-OR) and Ernest Gruening (D-AK) voted no. Led to 58,220 American deaths. Repealed in 1971.
War Powers Resolution
Requires president to notify Congress within 48 hours of committing forces. Widely ignored by every president since.
Authorization — Gulf War (1991)
Close Senate vote. Biden voted NO (then reversed his position for the 2003 Iraq War).
Authorization for Use of Military Force (2001 AUMF)
Only Barbara Lee (D-CA) voted no. "Let us not become the evil we deplore." This single vote authorized wars in 22 countries over 20+ years. Still in effect.
Authorization — Iraq War (2002 AUMF)
Based on false WMD claims. Biden, Clinton, Kerry all voted yes. 23 senators voted no including Byrd, Kennedy, Leahy, Durbin. Repealed in 2024.
Libya — War Powers Challenge
House rebuked Obama for not getting authorization for Libya bombing. Obama argued it wasn't "hostilities." No consequences.
Syria Strike Authorization (failed)
Obama sought authorization for Syria strikes after chemical weapons use, then withdrew the request when Congress clearly opposed it.
Yemen War Powers Resolution
First use of War Powers Resolution to end US involvement in a conflict. Bipartisan. Trump vetoed it.
2002 AUMF Repeal
Repealed the Iraq War authorization 21 years after passage. Bipartisan. 2001 AUMF still remains in effect.
📖 Why This Matters
The Constitution gives Congress the sole power to declare war. Yet the last formal declaration was in 1942. Since then, presidents have used “authorizations for use of military force” (AUMFs), executive orders, and creative legal interpretations to wage wars without declarations. The 2001 AUMF — just 60 words — has been used to justify military operations in at least 22 countries over two decades.