Which of the following most changed the makeup of the u. s. population in the early 1800s?

Expansion of its borders and its demographics

Explanation:

In 1800, there was a change in the makeup of the U.S population as a result of the expansion of its borders and its demographics. In 1803, the then United States President Thomas Jefferson grab an opportunity to obtain notable portion of land from France. As a result of the opportunity, the United States added 15 new states and expand their capacity which allows its citizens to keep on spreading west.      

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3 notebooks and 3 pencils packages

step-by-step explanation:

((3×1.25)+(3×2.75))=12

3×1.25=3.75

3×2.75=8.25

3.75+8.25=$12