USA webmasters abroad must be savvy and prove or verify his site is a USA web site in many ways, and do your best to not digitally prove outside USA.
USA Webmasters using Google Tools
So you want to work on Internet web sites from foreign countries, this could be the kiss of death. Your site could be defined by Google as owned by a person in Thailand and you will have no traffic inside the USA.
If you Webmaster is from a country outside the USA, this is the kiss of death for Indexing or Traffic is you are not extremely savvy and stop the foreign webmaster from doing many things.
Go to Google Webmaster Tools and click on verify your site and verify in all possible ways while still in the USA, and with a USA IP address. Or, if you want you can set up an VPN, or a computer at home and remote access.