An ancient greek city state developed a kind if government that didn't require a king people freely participate in the states government there was a council and an assembly in these government bodies citizens were able to discuss debate and vote on government matter

the Greek city-state had a democracy government.

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.

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

hope this : )