What MOST led to such high tension during the cold war? (communism/containment, space race, cuban missile crisis, etc.) How could this issue have been resolved before becoming a bigger problem?

Communism

Because US and Soviet Union wanted world dominance or a capitalist world (US) or a communist world (Soviet Union).

The Cold War began shortly after World War II, as the United States and the Soviet Union contested political, economic and military hegemony in the world. A direct armed conflict would mean the end of both countries and, probably, of life on planet Earth.

This could have been avoided if no country wanted to rule the world.

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.

it was douglas macarthur..