What is the leading cause of sources of petroleum in north american waters?

I believe the answer is: wells drilled on the ocean floor

Petroleum was created from the fossils of ancient organisms that has been dead and buried since million years ago. To extract it, we need to the ground till a certain depth until the oil leaked.

But, many companies decided to overlooked standard of safety in order to extract more oil from the ground. This caused a lot of oil to be leaked and absorbed to many water resources nearby, making it no longer consumable.

Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.

Ithink it is b  employees