Question

northerners reacted to anthony burnss and joshua glovers forced return to slavery by:
a. helping both of them regain their freedom.
b. writing protest letters to the president on their behalf.
c. helping other slaves escape from the south.
d. sending antislavery mail to southern post offices.

Explanation:

After Anthony Burns and Joshua Glover were forced back into slavery, Northerners showed their opposition by helping other slaves escape from the South. This was a form of resistance against the Fugitive Slave Act. Option A is incorrect as they couldn't help Burns and Glover regain freedom after they were returned. Option B - writing protest letters was not the main reaction. Option D - sending antislavery mail was not the reaction to these two cases.

Answer:

C. helping other slaves escape from the South.