Why is Shanghai the last "Noah's Ark" for Jews?

This sentence should be a literary evaluation of World War II.

During World War II, the Nazis massacred Jews and Jews fled Europe. More people began to move to their hometown than before (the first batch of Bilu were pioneers). Some people gradually approached Canaan by buying and selling land, while others packed their bags and drifted to the crescent land. The Arabs were frightened, so some of them joined hands with the Germans without hesitation. Later, considering the strategy of colonization in Arabia, Britain began to restrict Jews from entering Canaan, and even sent Jews to flee to Europe. Many Jews also flocked to the United States, and the United States, which adopted open immigration, gradually entered a state of saturation and could not absorb more refugees. Later, Jews fled to Shanghai, and Shanghainese helped and saved a large number of Jews.

My former English teacher was the son of a Jew in Shanghai. At that time, he was very young. His father took him to Shanghai, and his mother and sister went to America. He is an American now.

Literature evaluation is because Jews later occupied a place in the Middle East with their wisdom and efforts and established Israel.