1. The Roles and Jobs of the President of the United States

2. President Obama signs the Reinvestment and Recovery Act to help stimulate the economy.

3. Former President Reagan speaking in front of the Berlin Wall.

4. Former President George W. Bush greeting the press as he arrives back in Washington D.C. after visiting devastated New Orleans.

5. Former President George W. Bush giving his blessing before the lighting of the National Christmas Tree.

7. Former President George Bush Sr. meeting with his Chief of Staff.

8. President Obama meets with British Prime Minister Gordon Brown.

9. Former President Bill Clinton addresses a Joint Session of Congress.

10. President Obama nominated U.S. Appeals Court Judge Sonia Sotomayor, left, to the U.S. Supreme Court.

11. Former President Bill Clinton meets with Pope John Paul II.

12. President Obama addresses the United Nations General Assembly in New York City.

13. President Obama addresses the U.S. Congress.

14. President Obama speaking to the American People about health care and social security.

15. Former President George W. Bush and Former U.K. Prime Minister Tony Blair meet at the White House in the Blue Room.