Final answer:
The policy that favored people born in the United States during the early 1800s was called nativism. Nativism is the belief that native-born citizens should be favored over immigrants.
Step-by-step explanation:
The policy that favored people born in the United States during the early 1800s was called nativism. Nativism is the belief that native-born citizens should be favored over immigrants. This policy was fueled by concerns about the impact of immigration, particularly from countries with different cultures and religions. An example of this policy in action is the Chinese Exclusion Act of 1882, which restricted Chinese immigration to the United States.