Why did organized labor in the 1880s oppose an increase in the number of immigrants allowed to enter the united states?
a.
they believed that immigrants would soon return to their homelands.
b.
immigrants often took jobs for low pay, lowering wages for everybody else.
c.
immigrants often took higher paying jobs away from union members.
d.
there was not enough work in factories to support more immigrant workers.

it's B

Explanation:

The immigrants were willing to work for lower wages which resulted in lower wages for all.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

hope this

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.