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The Civil War in Syria was started on March 15, 2011 by a peaceful protest of the people against the government of Hafez al-Assad -
After suppressing the protests, the US enters and forces President al-Assad to resign -
President Barack Obama at the time declares the use of chemical weapons a "red line" -
The UN (United Nations Organization) orders Syria to destroy its chemical weapons after an agreement with Russia and the United States who threatens to use force if this is not fulfilled. -
Syria signs the convention on chemical weapons which prohibits it from using, storing or producing them. -
The Organization for the Prohibition of Chemical Weapons claims it has eliminated the Syrian government's arsenal, while the opposition claims otherwise -
The United States launches air strikes against the Islamic State (ISIS) in Syria due to the situation in that country. -
After an investigation into chemical weapons in Syria, it was determined that he used them on two occasions, which was prohibited by the agreement signed years ago.