How slavery in the colonies affected America
between 1861 and 1865.

Please help

While benefitting the south economically, the north disagreed morally and attempted abolishing slavery, causing the Civil War an the temporary separation of some southern states into the Confederate States.

Explanation:

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."