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.
Enbridge oil spill happened in 2010.
Rena oil spill happened in 2011.
Mingbulak oil spill happened in 1992.
Greenpoint oil spill happened in 1978.
Montara oil spill happened in 2009.
Prestige oil spill happened in 2002.
you can't. An oil spill can happen anytime, anywhere, be it by accident or on purpose.
Gulf War oil spill happened in 1991.
Sea Empress oil spill happened in 1996.
Xingang Port oil spill happened in 2010.
Full City oil spill happened in 2009.