Answer:
If I wanted to live in a state with plenty of land, and in which I could grow my own food or keep horses, with the closest neighbors as far as possible, I would go to Montana.
Step-by-step explanation:
Montana is the third less populated state of the United States of America in terms of population density, just behind Wyoming and Alaska. Therefore, as it is also one of the biggest states in terms of size (it is the 4th biggest state), there is plenty of non-occupied land, which would be perfect for the person who wanted to live in a state with the characteristics described in the question.