Answer:
D) They were afraid free African Americans would take their jobs.
Step-by-step explanation:
Though slavery had been abolished in the North, black Americans faced bigotry and discrimination in their every day life, in education, housing and regarding legal rights in northern states. Many poor white workers were afraid that if slaves from the South were liberated, they´d come massively to the North and take their jobs. Other people were concerned abouth the stability of the Union. Rich merchants of the North believed their profits would fall if slavery was a abolished in the South.