What was the main reason the north entered the civil war in 1861 ? a. to preserve the union b. to librate slaves c. to prevent unfair tarrifs d. to prevent european trade with the south

nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.

not sure but thinking i'ts cause the government was broke. not sure