What is the main reason that the alliance between ousamequins and the people of Plymouth ended?

Tens of thousands of English settlers arrived, overwhelming the region of New England

Explanation:

As soon as crowd arrive, they started to forcefully took ownership of various part of the regions that previously belonged to the Ousamequins. They can no longer hunt, collect woods, or plant their crops without being afraid of being attacked by the settlers.

This made it extremely difficult for the Ousamequins to collect enough food to survive. As a result, conflict between the Ousamequins and the people of Plymouth was unavoidable.

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."