The US has had many oil spills in its history including, most recently, the 2010 April 20 BP oil spill in the Gulf of Mexico off of Louisiana.
For other spills, please see related questions.
The oil spill occured in Summer, 2010.
Montara oil spill happened in 2009.
Mingbulak oil spill happened in 1992.
Enbridge oil spill happened in 2010.
Rena oil spill happened in 2011.
Greenpoint oil spill happened in 1978.
Prestige oil spill happened in 2002.
you can't. An oil spill can happen anytime, anywhere, be it by accident or on purpose.
West Cork oil spill happened in 2009.
Sea Empress oil spill happened in 1996.
Gulf War oil spill happened in 1991.
Katina P oil spill happened in 1992.