In the early 1800s, many people in the united states migrated westwards because

In the early 1800s, many people in the United States migrated westwards because of the availability of farmland.

Explanation:

The US government made policies to encourage the move of American citizens to the west of the country.

For example, the government giving lands to people that had the willpower to move to that side of the country.

what are local authorities doing to fix the problem

explanation: what are local authorities doing to fix the problem

yellow fever and other tropical diseases