Has Shanghai ever ventured to the East in the past?

I tell you, there were 500,000 people in Shanghai before the opening of 1842, and 6 million people in 1949. During the period of 100, the population increased by nearly 6 million. This was in the same period as the invasion of Guangdong. Aren't these 6 million immigrants called "invasion"? At that time, talented people went to Shanghai to do business, and farmers only embarked on a journey because they could not survive. So many people broke into Shanghai. They didn't enter Shanghai because they didn't have the ability. When Daniel Wu talked about Tiantangkou, he said that he was telling the story of a young man who broke into the sea. So the invasion of Shanghai exists, but it can't be summed up in one word. In fact, it is a large-scale immigration tide.