I do believe the correct answers are;
The industrial growth boosted economic growth in parts of Europe.
The new industrial technologies improved means of transportation.
Justinian I failed to regain all of the former provinces of the old Roman Empire really from a combination of all these reasons, but the main one was that he made military blunders.
For Montesquieu, despotism was one of the worst threats for a government. He pointed separation of powers as the best way to prevent it, in which legislative, executive and judicial power was excercised by different bodies of government, and these bodies were ruled by supreme law.
The system of checks and balances is very important for the U.S. government, since it was developed to assure that neither of the government's branches would empower too much. The writers of the U.S. Constitution developed a system that divides power between legislative, executive and judicial, and incorporates several limits and controls on the powers of every branch.
The Voting Rights Act of 1965 removed barriers to black enfranchisement in the South, banning poll taxes, literacy tests, and other measures that effectively prevented African Americans from voting.
