First year after 1945 when USA is officially at war again?

Question

The United States was last officially at war in 1945. When is this going to happen again? Resolves to the specific year when the war is declared if it happens by 2099; and "Not before 2100" otherwise.

Manifold Markets · Answer

Per Manifold Markets prediction market, 2030, followed by 2027 and 2029 are most likely. See the market for live updates (17 traders, as of Apr 5, 2026).