US Military Spending: Historical Trends
How American defense spending has evolved over eight decades.
World War II Peak (1944-45)
US military spending peaked at approximately 40% of GDP during WWII — the equivalent of roughly $10 trillion annually in today's terms. The entire economy was mobilized for war production.
Cold War Era (1947-1991)
Defense spending averaged 7-10% of GDP during the Cold War, with peaks during the Korean War (14.2% of GDP in 1953) and the Vietnam War (9.5% in 1968). The Reagan buildup of the 1980s pushed spending to $580 billion in today's dollars.
Post-Cold War "Peace Dividend" (1991-2001)
After the Soviet Union's collapse, defense spending dropped from 5.2% to 3.0% of GDP. Base closures, force reductions, and procurement holidays characterized this era.
Post-9/11 Surge (2001-2012)
The War on Terror drove defense spending from $316B (2001) to over $700B (2011). Including war costs, total defense spending peaked at $850B in 2010 (inflation-adjusted). This era saw the simultaneous prosecution of wars in Afghanistan and Iraq.
Sequestration & Recovery (2013-2020)
The Budget Control Act of 2011 imposed spending caps, temporarily reducing defense spending. The caps were repeatedly raised through bipartisan deals, and spending resumed its upward trajectory by 2018.
Current Era (2021-Present)
The combination of great power competition with China, Russia's invasion of Ukraine, and Middle East tensions has driven defense budgets to nominal all-time highs exceeding $886B, though as a share of GDP (3.4%) this remains well below Cold War levels.