In what areas was the united states a leader after the war?

a) politics
b) economics
c) politics & economics

The correct answer is the letter B.

The growth of the US economy was also fueled by historical events such as World War I (1914-1918), and World War II (1939-1945) when Europe was undergoing reconstruction, so the US provided loans and resulting in a huge GDP growth and consolidating definitively as the world's largest power.

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.