The regions of the east that helped out Sauron were Numenorean colonies.
Umbar was, Khand was not but it was iirc ruled by nazgul, Easterlings and Haradrims actually had a very good reasons to ally with Sauron because every time Gondor had a good period, it invaded them. Also depictions of Haradrim iconography suggest it was just one faction out of that huge land.
Umbar was, Khand was not but it was iirc ruled by nazgul, Easterlings and Haradrims actually had a very good reasons to ally with Sauron because every time Gondor had a good period, it invaded them. Also depictions of Haradrim iconography suggest it was just one faction out of that huge land.