The u.s. dropped an atomic bomb on hiroshima
Answer:
U.S.A:00 / 0 votes)Rate this definition: United States, United States of America, America, the States, US, U.S., USA, U.S.A. (noun) North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean
C.S.A:Confederate States of America.
Explanation:
They were signing a petition to establish the 'Columbia Territory'.