What did the Monroe Doctrine do? A. It encouraged religious practices through the government.

B. It maintained slavery throughout the South, but abolished it in the North.

C. It warned Europeans against colonization in the Americas.

D. It established a trade alliance with England.

Explanation:

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i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

d.summerains, the last one