Poverty, because it is a negative factor, causing someone to want to leave the country.
For Congress to declare independence, a majority of delegations would need authorization to vote for independence, and at least one colonial government would need to specifically instruct (or grant permission for) its delegation to propose a declaration of independence in Congress.
Because the printing press was not invented until later, so before that all books had to be copied by hand. It was very time-consuming and required a lot of skill.
