In the late 19th and early 20th centuries, European immigration to the United States became increasingly diverse and increased substantially in numbers. Beginning in the 1890s, large numbers of Southern and Eastern European immigrant groups such as the Italians, Jews, and Poles arrived. Many returned to Europe but those who remained merged into the cultural melting pot, adopting American lifestyles. By contrast, Chinese arrivals met intense hostility and new laws in the 1880s tried to exclude them, but many arrived illegally. Hostility forced them into "Chinatowns" or ethnic enclaves in the larger cities, where they lived a culture apart and seldom assimilated. The acquisition of Hawaii in 1898, with full citizenship for the residents of all races, greatly increased the Asian American population.