First Nuclear Test's Radiation Spread Farther Than Expected and Impacted Civilians

The 1945 Trinity test, the first nuclear explosion, produced more powerful effects and wider radioactive fallout than the Manhattan Project anticipated.
Modeling shows the Trinity test's radiation reached 46 U.S. states, parts of Canada, and Northern Mexico within 10 days.
Nearby New Mexico communities were heavily affected, with health issues and radiation exposure persisting for generations.
Historians argue the test marked the start of the Anthropocene era as radioactive isotopes entered and altered the environment globally.
Advocates cite new data showing extensive fallout in calling for federal compensation for downwind civilian exposures.