The word "were" isn't a coordinating conjunction because it simply isn't able to connect two independent clauses and put them together to form a compound sentence.
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Anglo-Saxons
The first people to be called 'English' were the Anglo-Saxons, a group of closely related Germanic tribes that began migrating to eastern and southern Great Britain, from southern Denmark and northern Germany, in the 5th century AD, after the Romans had withdrawn from Britain.
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Is this even a real question?