CAN SOMEONE HELP ME PLEASE with these 2 questions

Why do countries create guidelines and laws on how a country is going to be run?

This document provides the framework for the united states government. it consists of three main parts: the preamble, seven articles, and 27 amendments.

How would high tariffs hurt america? a. fewer immigrants would be able to move to america b. sales of american products to other countries would go down c. americans would sell more goods to other countries d. goods imported from other countries would cost less