Why do paine thought it was so important to have a written constitution

Thomas Paine believed that our God-given, inalienable rights can best be assured for all persons through the agency of a written constitution.  A written constitution details exactly how we together as citizens will respect and safeguard our own and one another's rights within the society we establish by our constitution.  A constitution also prevents a government that rules without the consent of the governed.

In an essay entitled, "Of Constitutions, Governments, and Charters," Paine asserted:  "A constitution defines and limits the powers of the government it creates. It therefore follows, as a natural and also a logical result, that the governmental exercise of any power not authorized by the constitution is an assumed power, and therefore illegal."

They were factory workers, usually in an assembly line. Hope this helped!