Although dry regions may never be as densely populated as those near water, which of the following factors has led to increased populations in dry areas?

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.