Answer:
B and D
Step-by-step explanation:
The effects of the Louisiana Purchase were:
b) The size of America almost doubled
d) New Mexico and Texas were brought into the United States.
The Louisiana Purchase was a significant event in American history, as it marked the first time that the United States had acquired a large amount of territory from another country. As a result of the purchase, the size of the United States almost doubled, as it gained control of a vast region that included parts of what are now 15 different states. The purchase also brought New Mexico and Texas into the United States, which would later become important states in their own right. While the Louisiana Purchase did provide the United States with useful information about the territory, it did not directly affect Native Americans or California.