What is the main factor in American expansionism west?

The most important forces are population growth and the decrease in transportation costs," Vandenbroucke said. "Population growth is mostly responsible for the investment in productive land - without it less than half of the land accumulated in 1900 would have been accumulated."

cruel, heartless

explanation:

1.the 80s' fashion for men was like a mixed bag that had skinny tights, leather pants, and jackets, parachute pants (or hammer pants), leg warmers, very short shorts, ripped and stone-washed denims, frilly puff-sleeved shirts, oddly striped shirts, skinny neck ties, hawaiian shirts, jams, nylon tracksuits in neon colors.

2.

3.colored tvs, malls, telephones

explanation:

google searches