Which president was in office during the September 11, 2001 attacks?

Which president was a former peanut farmer from Georgia? Which president was a Hollywood actor before entering politics? Which president said "Mr. Gorbachev, tear down this wall!"? Which president led the U.S. during the 1991 Gulf War? Which president signed the Affordable Care Act in 2010? Which four presidents won the Nobel Peace Prize? Which president was the first to win the Nobel Peace Prize, in 1906? In which state was Abraham Lincoln born?