Here are the American presidents who were in office during the events you mentioned:
- The Persian Gulf War (1990-1991) - President George H.W. Bush
- The signing of NAFTA (North American Free Trade Agreement) - Signed in 1993 during the administration of President Bill Clinton
- The Iran-Contra Affair (1980s) - Primarily occurred during the presidency of Ronald Reagan
- The September 11 attacks (2001) - Occurred during the presidency of George W. Bush
- The development of the Strategic Defense Initiative (announced in 1983) - Initiated under President Ronald Reagan
- The fall of the Berlin Wall (1989) - Occurred during the presidency of George H.W. Bush
- The War on Terrorism (initiated after the September 11 attacks in 2001) - Initiated under President George W. Bush
Let me know if you need more information on any of these events!