TIMELINE - Iraq from invasion to pact

(Reuters) - Following is a chronology of key events in Iraq since the U.S.-led invasion in 2003 that toppled Saddam Hussein.

March 20, 2003 - U.S. and British forces invade from Kuwait.

April 9 - U.S. troops take Baghdad, Saddam disappears.

July 13 - The Iraqi Governing Council -- 25 Iraqis chosen under U.S. supervision -- holds inaugural meeting in Baghdad.

August 19 - Suicide truck bomb wrecks U.N. headquarters in Baghdad, killing 22 people, including U.N. envoy Sergio Vieira de Mello.

December 13 - U.S. troops capture Saddam near Tikrit. U.S. governor Paul Bremer breaks news with: "We got him."

March 8, 2004 - Iraq Governing Council signs interim constitution.

June 1 - Governing Council dissolved to make way for interim government led by Iyad Allawi. Ghazi al-Yawar named president.

June 28 - United States formally returns sovereignty. Coalition Provisional Authority dissolved. Bremer leaves Iraq.