What was a long-term effect of the events pictured in the map? O Migration of settlers

D. Established the Southern border of the United States

I say your best bet is D

Explanation:

I think it's A.

Explanation:

The stated mission of the organization is to "coordinate and unify the petroleum policies of its member countries and ensure the stabilization of oil markets, in order to secure an efficient, economic and regular supply of petroleum to consumers, a steady income to producers, and a fair return on capital for those investing in the petroleum industry."

*Found this on Wiki*