The president shall be commander in chief of the army and navy of the united states, and of the militia of the several states , when called into the actual service of the united states. this excerpt from article ii of the u. s. constitution describes which of the president's major functions?

The correct answer is serving as the leader for the U.S. military.

sectionalism continues to divide the nation as the question of slavery being allowed in the mexican cession became a problem. -the results of the mexican war spark secession in the south because the north did not want to allow slavery in the territories won.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."