Buying a Car from Canada But I am in the united states please help?

Okay Im purchasing a car from a private person in canada right so the problem is i live in minnesota coon rapids in the us and the car is of course in canada is it true if i buy the car from canada the goverment will tax me when i bring it back to the states? if so how much will the charge me the car is a 2007 mustang by the way