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This question already has an answer here:

Which sentence is correct in this case?

  1. Class conflict and class exploitation are the prime moving force in history of mankind
  2. Class conflict and class exploitation is the prime moving force in history of mankind?

marked as duplicate by Edwin Ashworth, JJJ, David, Bread, J. Taylor May 16 '18 at 19:30

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  • This question is basically the reverse of Agreement in “{Singular Noun} Is/Are {Plural Noun}”? As with that question, you are supposed to make the verb agree with the subject. – sumelic May 14 '18 at 22:14
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    You could improve your English by avoiding "prior to" when "before" will work. Familiar, short, Anglo-Saxon. – David May 15 '18 at 18:31
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I would say "are the prime moving forces (plural)...". Your subject is two things. I would also say "the history" and "humankind" rather than "mankind". :)

  • I agree with Brenda about the grammar ("are" and "the prime") of the sentences. – tautophile May 14 '18 at 17:04
  • Better still, “... in human history,”. But the objection to “mankind” was worth making. – Tuffy May 14 '18 at 20:17

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