How can you change the country of your itunes store?

My itunes store has the Mexico one that's where i bought it but i live in the US. I would like to change it to the US store but have no idea how to! Please help! Thanks!|||open the player window and scroll down to the bottom. click on the flag to choose the country you want an account for|||When you go into the iTunes store, go all the way to the bottom. There should be a thing that says My Store: and have a country beside it. Mine says United States so yours should say Mexico. Click on the drop down arrow and choose United States.