During the 1800s, why were more americans moving from the country to the cities?

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

In the supreme court’s decision in korematsu v. united states, the court said that korematsu

The impeachment of president clinton by the u.s. house of representatives occurred with a. virtually all republicans supporting it, while virtually all democrats opposed it b. about two-thirds of republicans supporting it and about two-thirds of democrats opposing it c. half of all democrats and half of all republicans supporting it, while half of all democrats and half of all republicans opposed it d. virtually all democrats supporting it, while virtually all republicans opposed it