What played a major role in shaping pro-war opinion in the United States?

Media Propaganda.

Explanation:

Media propaganda was instrumental in shaping pro-war opinion in the United States as the media was used as a tool. To motivate, shift blame, make the government appear totally in control (even when they weren't), etc.

This media propaganda was particularly useful to paint the enemy as totally evil, justifying the war, blaming losses on spies, saboteurs, etc and never allowing the government to take the full blame.

yes i can of course like what is it gonna be about

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.