Respuesta :

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

Answer:

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.

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