Economic+opportunity,+e.g.,+gold+(California+Gold+Rush),+logging,+farming,+freedom+(for+runaway+slaves)+influenced+what?

nana Economic opportunity, e.g., gold (California Gold Rush), logging, farming, freedom (for runaway slaves) influenced what?-It influenced migration west.

-gold rush    -farming          -freedom for runaway slaves

-logging

media type="custom" key="68844"

my google earth-