Why were Roman armies unstoppable?

Explanation:

Rome became so powerful was because of the strength of its army.The soldiers were the best trained, they had the best weapons and the best armour.

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

apartheid, (afrikaans: “apartness”) policy that governed relations between south africa's white minority and nonwhite majority and sanctioned racial segregation and political and economic discrimination against nonwhites. people should not get this wrong. i was just answering a question.