1. A person can have more than one RESIDENCE but only ONE DOMICILE (read tax home). Think of a student in college. The student's residence is at the college, but since they do not plan to "return there after college" their domicile is at home with their parents. If the student take a summer job in a different state, their residence is in the new state for the summer. Residence can change as often as your mailing address.
2. The States wants tax $. So most states require you to purchase a new car tag if you are in the state more than 30 (?) days or if you take a job in the state or you send children to school in the state. States want you to purchase new tags when you change your mailing address and almost all have some type of such law.
3. To vote in a state most require you to live in the new voting location for a longer period of time -- say 90 days. This is to prevent people from moving to effect an election.
