Answer:
The correct answer is the first, They feared competition from black workers.
Explanation:
The reason why some northern workers opposed abolitionism was because they saw the liberation of black people as a potential threat to their jobs because of competition.
It must be said though that records show it was a minority of norther workers who were explicitly and actively <em>against</em> abolitionism. Most of the time workers weren't active supporters because they saw themselves as wage slaves struggling to survive who didn't have time to fight for anything else.
Answer:
I believe that it was Russia
Answer: They are called Monomers