How did northerners feel about slavery in the territory gained by Mexico? Southerners?

What is walt whitman's poem "when i heard the learn'd astronomer about?

The enforcement clause of the fourteenth amendment states what congress had the authority to a. grant citizenship to people b. change the constitution c. enforce only the bill of rights d. make laws to apply the amendment

Which of the following is not one of the five informal ways to amend the constitution? oa) state legislation ob) presidential actions oc) supreme court decisions od) political party activities