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Why did Shanghainese suddenly emigrate?

170 years ago, Shanghai opened its port, and immigrants came from Jiangsu and Zhejiang! So Shanghainese are originally from Jiangsu and Zhejiang! In the 1990s, Shanghai ushered in a new wave of immigrants. However, they are mainly from Jiangsu and Zhejiang! So the earliest Shanghainese were a combination of Jiangsu and Zhejiang people!