Question

prior to the twenty - first century, what events influenced offshore oil exploration in the united states the most?
oil spills
disruption of marine wildlife
low gasoline prices
wars in south america
question 4
what major piece of legislation forced government agencies to prepare environmental impact statements?
clean water act of 1977
national environmental policy act of 1969
clean air act of 1963

Explanation:

For the first question, oil spills have had a significant impact on public perception and regulations regarding offshore oil exploration in the US prior to the 21st - century. For the second question, the National Environmental Policy Act of 1969 (NEPA) requires federal agencies to assess the environmental effects of their proposed actions and prepare environmental impact statements.

Answer:

For the first question: oil spills
For the second question: National Environmental Policy Act of 1969