1258 Mesopatamia and its capital Baghdad falls to Mongol invaders led by the grandson of Genghis Khan. The Arab Empire was destroyed.
1500s The Ottoman Empire conquers the region.
1700s The Ottoman power in Mesopotamia begins to decline
1800s Great Britain becomes involved with Mesapotamia needing to protect their trade routes with India and the East
1914-1918 World War I
1917 British troops occupy Baghdad
1920 The League of Nations give Great Britain a mandate to rule over Mesopotamia
1920 The San Remo Peace Conference of Allied Powers. Mesopotamia is renamed Iraq
1921 The British set up King Faisal I as the monarch and control the government
1925 The League of Nations sets the border between Turkey and Iraq which places the Mosul region in Iraq rather than Turkey against the wishes of the Kurdish population
1932 Iraq become independent
1937 April 28 - Saddam Hussein was born
1939 WW11 breaks out
1940-1941 The Iraqi government allies with Germany, Italy and Japan seeking to rid Iraq of British power and influence
1941 Great Britain defeat Iraq
1945 End of WW11 and Iraq helps to form the Arab League
1948 The Arab League declares war against the newly formed Israel
1950-1952 Iraq signs agreements with foreign oil companies and receives 50% of the oil profits
1953 Faisal II became king of Iraq
1950s Many Iraqis began to oppose the monarchy. They wanted a say in the government
1955 Iraq signed the Baghdad Pact with Iran, Pakistan, and Turkey
1958 Iraq becomes a republic during a military coup and the monarchy is killed
1979 Saddam Hussein succeeds Al-Bakr as Iraqi President
1980 Iraq invades Iran
17 January 1991 A coalition of 39 countries begin bombing Iraq starting the Persian Gulf War

This information focuses on the history of Iraq and does not address modern-day events