The sentence that best describes the effects of the Louisiana Purchase on the United States is that it caused the size of the United States to double, providing vast areas for farming. Thus, Option D is the correct answer.
<h3>What do you know about Louisiana Purchase?</h3>
The acquisition of imperial rights to the western half of the Mississippi River basin from France via way of means of America in 1803 is known as the Louisiana Purchase.
The deal granted the USA the only authority to attain the land from its indigenous inhabitants, both via way of means of settlement or via way of means of conquest.
Therefore, Option D is the correct answer.
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