Answer:
Expansion of its borders and its demographics
Step-by-step 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.