Question

what factor pulled imigrants to the us?

Answer 1

Potential employment

Answer 2

Depends on the era. The first settlers came here fleeing religious or social persecution in Europe, plus a few speculators and criminals and unfortunates trying to start over. Later immigrants came for economic opportunities and class mobility (i.e. being able to become wealthy and important without having to be born with the right name, or of the right race, class, or political party).