The Spanish had a positive effect on Aztec civilization because they helped modernize the society. They introduced the Aztecs to domestic animals, sugar , European farming practices.
The primary incentives for European exploration in the New World was to gain riches and resources such as gold and sugar, and the reason why many Asian countries chose to isolate themselves is because they were doing well economically and did not want any "shake up" from European powers.
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Ancient Greece and ancient Rome
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The Great Depression I believe comrade
