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  • buying the louisiana territory raised a constitutional issue for president jefferson, since the document said nothing about purchasing new lands. jefferson decided that keeping france from controlling the mississippi river was too important, though, to turn down the opportunity. so the purchase was judged necessary and the senate readily approved it in 1803. congress paid france about $15 million for the land.

    the louisiana purchase doubled the land area of the nation, adding 800,000 square miles and more than 200,000 people-primarily american indians, spanish, and french.