To install US-only apps on your Xbox 360, you will need a US Xbox Live Account. Please follow the guide below.
- Go to http://www.xbox.com/en-US/live.
- Click the sign-up link.
- Look for Don't have a Microsoft account? Sign up now and click the sign-up link.
- Fill out the form and make sure to set USA as your country - choose a US zip code like 90210.
- Go on and upgrade to Xbox Live Gold.
- When filling out the info, make sure to use a fake US address. Use zip code 90210, Beverly Hills, California, or something of that nature.
- You can log in with your new Xbox Live Gold account on your Xbox and install US-only apps.