The United States conducted its first successful nuclear test in 1945.
Notes on verification
Well-documented historical fact confirmed by multiple authoritative sources including the U.S. Department of Energy, Britannica, and U.S. Air Force records. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.539 clusters=2 claim_tier=everyday]
Sources
- List of states with nuclear weapons (wikipedia)
- https://www.energy.gov/lm/trinity-site-worlds-first-nuclear-explosion (corroboration)
- https://www.afnwc.af.mil/About-Us/History/Trinity-Nuclear-Test/ (corroboration)