The us population tripled between 1790 and 1830 primarily because of?

Various factors are contributing to the rise of the population of the United States:

a) There was a large population of young Americans who were starting families.

b) There as a decline in mortality rate, thus further boosting the population.

c) The area was expanding as new states were merging, providing enough space for the growth of population.

The industrial revolution. There was now an excess amount of product and people started having less kids however, those kids survived.