The main reason why the Mayflower Compact was an important document for the Plymouth colony was because it spelled out basic rules that the settlers were expected to follow in order to maximize the likeliness of their survival. It was actually drafted and signed onboard the Mayflower before the settlers arrived.
B, because it was unconstitutional.
<span>Old immigrants often had property and skills, while new immigrants tended to be poor, unskilled workers.
Hope this helped! </span>