I often meet people who think of the good old days when a medical school graduate would complete an internship (one year) and then become a general practitioner. Many states still allow you to get a license after an internship, but that seems to be changing.
The Federation of State Medical Boards keeps a list of the initial requirements for medical licensure. This list was updated in May 2008 and you can see that many states are requiring more than one year of post graduate training.
The other important aspect that people seem to forget is: will insurance companies have you on their plan if you have not completed a medical or surgical residency? Short answer = not likely.
Also, can you get hospital privileges if you only complete an internship?
So what are your options?