Manage Account Region I couldn't see USA to change , how to change the my account to USA market region ?
You can't. The region migration tool is only available for the 9 newly added countries to Live.
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As above, you can only change it to a new Xbox LIVE country, not an existing one. So you will need to make a new account.
Do you physically live in the USA? Or are you just trying to bypass region restrictions/gain access to content otherwise not available to you in your current region?