Final answer:
The major territorial purchases made by the United States had a significant impact on the country, leading to westward expansion, economic growth, and increased political power. However, they also resulted in the mistreatment of Native Americans and the perpetuation of slavery.
Step-by-step explanation:
The major territorial purchases made by the United States had a significant impact on the country. The Louisiana Purchase in 1803 doubled the size of the United States and provided valuable resources and access to trade routes. The acquisition of Alaska in 1867 expanded American influence in the Pacific and provided access to rich natural resources. The purchase of the Gadsden Territory in 1853 helped to complete the continental railroad and opened up new opportunities for trade and settlement.
The impact of these territorial purchases was both positive and negative. They led to westward expansion, economic growth, and increased political power for the United States. However, they also resulted in the displacement and mistreatment of Native American populations and the perpetuation of slavery.
As a result of these purchases, the United States became a larger and more powerful nation. It solidified its control over North America and set the stage for further westward expansion and territorial acquisitions in the future.