You are mistaken about the cause of the the Boston Tea Party. It was not about taxation without representation; it was about lack of taxation on tea from the East India corporation (which the King and his friends had a financial interest in). Many of the people protesting were owners in the local tea companies who's product was suddenly undercut because the King did not want to lose money on teas that were not selling in England.

The "no taxation without representation" was a slogan applied after the fact.

Americans can vote overseas though

Not all of them and even if you are eligible to vote, some states make it nearly impossible to request a ballot. I’ve been removed from the registry multiple times and had to fill out an emergency ballot which didn’t even get counted in the 2016 election.

I know. I was referring to the comment about not feeling represented.

“No taxation without representation” does not imply “no representation without taxation”.