The north used the rising number of immigrants to .The south felt no need to employ immigrants on their plantations because

poopy butthole

Explanation:

sup baby

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week

the crusaders are identified in the painting;

c. by the red crosses on their backs