One reason why English immigration to the colonies dropped dramatically after 1660 was because "<span>c. The English economy improved and political and religious conflict diminished," since this had been a major motivation for much of the colonial emigration leading up to this point. </span>
A two-thirds majority vote in both the House of Representatives and in the Senate is required to override a presidential veto. The exact number depends on how many representatives vote; therefore, the actual number is subject to change.
I hope this helps with your work you’re welcome