Why did jefferson want the united states to expand in the early 1800s?

To provide more farm land for its growing population

Explanation:

The first half of the nineteenth century in US history was marked by the conquest of territories. The population, at that time, went from 3,900,000 in 1790 to 7,200,000 in 1810, forming an essentially agrarian society, formed by farms in the Northeast and large exporting farms in the Southeast. Because of this growing population, Yhomas Jefferson wanted the United States to expand, because it would be possible to provide more farmland for the people.

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration