How old was george h bush when he took office?

The theory of mercantilism holds that a nation's economic power comes from a a.enslave people b.become industrial c. willingness to explore d.favorable balance of trade

Ineed asap! ! what is the name of the system in which each branch of the u.s government can limit the actions of the other branches? a. perpetual union b. division of powers c. cooperative federalism d. checks and balances

Why did china build the great wall of china?