What big shift in thinking, away from Medieval patterns, occurred among the leaders of the Renaissance and how did the classical civilizations of ancient Greece and Rome influence them? PLEASE HELP ME

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

where are the statements?

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

"the attempts of the proletariat to rise above this abasement"