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 in US history. Closest war vote ever — nearly 40% of the House voted against. Federalists nearly unanimously opposed. Driven by War Hawks like Henry Clay and John C. Calhoun who demanded action against British impressment of American sailors and support for Native American resistance.
Declaration of War — Mexican-American War
Abraham Lincoln (then a Congressman) challenged Polk's justification with his 'Spot Resolutions,' demanding to know the exact spot where American blood was shed. Many Whigs voted yes reluctantly, fearing being labeled unpatriotic. The war was widely seen as a land grab for slaveholding territory.
Declaration of War — Spanish-American War
Launched American empire. The Teller Amendment promised the US would not annex Cuba — a promise partially kept for Cuba but ignored for the Philippines, Puerto Rico, and Guam. Yellow journalism by Hearst and Pulitzer manufactured war fever after the mysterious explosion of the USS Maine.
Declaration of War — World War I
Jeannette Rankin (R-MT), the first woman in Congress, voted no. She later voted against WWII — the only member to vote against both. The House vote came at 3:12 AM. Senator Robert La Follette (R-WI) led the opposition, delivering a 4-hour speech against the war.
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.' She was booed and had to be escorted by police. The Senate vote was unanimous. Roosevelt's 'Day of Infamy' speech lasted just 6 minutes.
Declaration of War — World War II (Germany & Italy)
Completely unanimous — not a single dissent in either chamber. Germany and Italy declared war on the US first, making Congress's vote a formality. This was the last formal declaration of war by the United States. Every military action since has been conducted through authorizations, resolutions, or executive action alone.
Gulf of Tonkin Resolution
Based on a fabricated attack. The August 4 'second attack' on USS Maddox never happened — NSA documents declassified in 2005 confirmed this. Only Wayne Morse (D-OR) and Ernest Gruening (D-AK) voted no in the Senate. The House vote was unanimous. This single vote authorized the deaths of 58,220 Americans. Repealed in 1971.
War Powers Resolution
Requires the president to notify Congress within 48 hours of committing forces and to withdraw within 60 days without congressional authorization. Nixon vetoed it; Congress overrode. Every president since has considered it unconstitutional. It has never been enforced.
Authorization — Gulf War (1991)
The closest Senate war vote since 1812. Biden voted NO (then reversed his position for the 2003 Iraq War). Sam Nunn (D-GA), chairman of the Armed Services Committee, led the opposition. Bush Sr. indicated he might proceed without authorization — Congress authorized to preserve its institutional relevance.
Authorization for Use of Military Force (2001 AUMF)
Only Barbara Lee (D-CA) voted no. 'Let us not become the evil we deplore.' Passed just 3 days after 9/11. This 60-word authorization has been used to justify military operations in at least 22 countries across 4 presidential administrations. Still in effect as of 2026 — the longest war authorization in American history.
Authorization — Iraq War (2002 AUMF)
Based on false WMD claims. Biden, Clinton, Kerry, and Edwards all voted yes — a vote that haunted their future presidential campaigns. 23 senators voted no, including Robert Byrd, Ted Kennedy, Patrick Leahy, Dick Durbin, and Paul Wellstone. Repealed in 2024 — 21 years after passage.
Libya — War Powers Challenge
House rebuked Obama for not getting authorization for Libya bombing. Obama argued the 78-day bombing campaign didn't constitute 'hostilities' under the War Powers Resolution — a legal argument widely mocked. No consequences followed the rebuke.
Syria Strike Authorization (failed)
Obama sought authorization for Syria strikes after chemical weapons use at Ghouta (1,400+ killed), then withdrew the request when Congress clearly opposed it. Russia brokered a deal for Syria to give up chemical weapons. One of the rare cases where congressional opposition stopped military action.
Yemen War Powers Resolution
First successful use of the War Powers Resolution to direct the removal of US forces from a conflict. Bipartisan — 7 Republicans voted yes in the Senate. Trump vetoed it. The war in Yemen, supported by US intelligence and refueling for Saudi Arabia, has killed an estimated 377,000+ people.
2002 AUMF Repeal
Repealed the Iraq War authorization 21 years after passage. Bipartisan — 49 House Republicans and 18 Senate Republicans voted for repeal. The 2001 AUMF — the broader and more consequential authorization — still remains in effect and continues to be used to justify military operations worldwide.
📖 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.