Why do countries that have proportional representation, parliaments and unitary

Why do countries that have proportional representation, parliaments and unitary governments see higher voter turnout than countries that use winner take all elections, separation of powers and federalism? What is a realistic reform that could increase voter turnout in the United States? 2.ย ย ย  How did proposition 14 change the way we select candidates for political offices in California? Are we better off than before? Are there any problems with the new system? 3.ย ย ย  Who is most likely to vote for Democratic candidates for office? Who is most likely to vote for Republican candidates? Explain why one of these groups of people typically votes Democrat and why one Republican leaning group votes for that party. 4.ย ย ย  How is the United States a leader in world politic? In what ways has it lost its leadership position? Are these changes good or bad?