Then, city's economy grew and more people migrated there from other parts of the world. many of the immigrants were Germans, Jews, Irish, Swedes, Poles, and Czechs. The immigrants were almost two-thirds of the city's population. In 1889, Jane Addams built Hull house in Chicago for children and the poor. In 1893, the city hosted the World's Columbian Exposition. In 1892, they created the University of Chicago.