For about how long did the Roman Empire have capitals or government operations in both the East and the West?

What is the contribution of women in making the family and in the nation?

The principle of checks and balances is based on the notion that

What was the name of the theory that said that if one country in a region fell to communism, others would surely follow? 1) domino theory 2) arms race 3) brinkmanship 4) containment theory