Answer:
It occurred during the 1870s to about 1900.
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Naturalization is the process during which people not having citizenship to a country receive their citizenship. It’s purpose is to give full rights to people who anyway live and contribute to the society rather than alienate them
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"middle class" and "working class" would be the best options, since the Industrial Revolution created thousands of new jobs, which put thousands more people to work.
During the Ming Dynasty, China closed its borders to the outside world because they were worried about the influence of the West. There were many Europeans travelling around the world and spreading their religion, ideas, and then dominance. China didn't want the West's religion, ideas, or dominance in their country.