Who was allowed to rule tome and establish an empire in place of the Roman republic

Caesar Augustus

Explanation:

Octavian in 29 BC declared himself Roman emperor, assuming the name of Caesar Augustus. Under his rule, the Roman Empire became an austere and centrally controlled monarchy

checks and balances are needed to keep the government running smoothly, they allow the three branches of government to overrule one another so that one branch of government does not become too powerful.

tearing down the berlin wall.