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What was the effect of the Louisiana Purchase? It doubled the size of the country and provided control of the Mississippi River. It improved relations with England and Canada and prevented Indian invasions. It stimulated the economy and strengthened the alliance with France. It prevented a western attack on the United States by Spain.

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Answer:

It doubled the size of the country and provided control of the Mississippi River.

Explanation:

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The first impact is that it doubled the size of the country. Our borders went from the Atlantic Ocean to the Rocky Mountains, north to Canada, and south to the boundary with Spanish Florida. It helped to secure the port of New Orleans and the use of the Mississippi river for us.