Which four presidents are carved into Mount Rushmore?

In which city was the Declaration of Independence signed? In which city is the Liberty Bell displayed? Which country gave the Statue of Liberty to the United States? In what year was the Statue of Liberty dedicated? In which state is Mount Rushmore located? Whose portrait appears on the U.S. one-dollar bill? Whose portrait appears on the U.S. five-dollar bill? Whose portrait appears on the U.S. twenty-dollar bill?