In the 19th and early 20th centuries, Jewish immigrants from around the world arrived with Western commercial influences, particularly in the commercial centers of Hong Kong, which was for a time a British colony, Shanghai (the International Settlement and French Concession), and Harbin (the Trans-Siberian Railway). In the first half of the 20th century, thousands of Jewish refugees escaping from the 1917 Russian Revolution and the Holocaust in Europe arrived in China. However a majority of them immigrated to Israel and various western countries after the communist takeover in 1949.