Worst financial crisis since Great Depression.

Barack Obama elected president.

American Recovery and Reinvestment Act passes.

Patient Protection and Affordable Care Act passes.

Wall Street Reform and Consumer Protection Act passes.

United States ends combat operations in Iraq, increases troops in Afghanistan.

Osama bin Laden killed.

Arab Spring uprisings begin.

President Obama reelected

U.S. Supreme Court declares that same-sex couples have constitutional right to marriage.

Iran nuclear deal signed.

U.S. restores diplomatic relations with Cuba.