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In the 1st Age, Men which had sided with Morgoth (the First Dark Lord) were collectively known as Easterlings
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Easterling was not a collective name for the men that sided with Morgoth, it was the term for the men who came from the east. Many were in the service of Morgoth but not all, Bor was an Easterling who fought against Morgoth.
The main reason that the Easterlings sided with Sauron was that they worshipped him as a god-king. For thousands of years they thought Sauron was their god, so it is no wonder that they sided with him, because who would refuse to fight for their god.