How did differences between the states affect how they participate in the war?

The States that formed the Union were located in the north. They were characterized for the following:

On the other hand, the states that formed the Confederacy were located in the south and were characterized by:

the new jersey plan most resembles the articles of confederation.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.