The Modern Era spanned at this time. Hope this helps.
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Answer:Karl marx
Explanation: Karl Marx is the most well-known creator of the theory of socialism, and of communism. He wrote a book about capitalism, socialism, and communism, called "A critique of the social economy". Friedrich Engels co-wrote the book, and paid for much of Marx's work and research.
Answer:
I believe it's all of the above but I'm not 100% sure but most of the time it will be all of the above