Deepwater Horizon oil well spill in the Gulf of Mexico begins on April 20 and causes an environmental and economic crisis for the Gulf of Mexico region of the United States. The well is finally capped on July 15 and sealed on September 19.
The North American Free Trade Agreement (NAFTA) between Canada, the United States, and Mexico, is signed into law by President Bill Clinton on December 8.
On November 3, the Iran-Contra affair, an elaborate arms-for-hostages deal orchestrated by the Reagan Administration involving the Israelis, Iranians, and the Contras (anti-Communist guerillas in Central America), is revealed in a Lebanese Magazine.