and early 20th century, due largely to economic opportunity in the U.S., displacement caused by the hardships of Ottoman rule, the Balkan Wars, and World War I. Most of these immigrants had come from southern Greece, especially from the Peloponnesian provinces of Laconia and Arcadia. 450,000 Greeks arrived to the States between 1890 and 1917, most working in the cities of the northeastern United States; others labored on railroad construction and in mines of the western United States; another 70,000 arrived between 1918 and 1924. Each wave of immigration contributed to the growth of Hellenism in the U.S. Greek immigration at this time was over 90% male, contrasted with most other European immigration to the U.S., such as Italian and Irish immigration, which averaged 50% to 60% male. Many Greek immigrants expected to work and return to their homeland after earning capital and dowries for their families. However, the loss of their homeland due to the Greek genocide and the 1923 population exchange between Greece and Turkey, which displaced 1,500,000 Greeks from Anatolia, Eastern Thrace, and Pontus caused the initial economic immigrants to reside permanently in America. The Greeks were de jure denaturalized from their homelands and lost the right to return, and their families were made refugees. Additionally, the first widely implemented U.S. immigration limits against non Western European immigrants were made in 1924, creating an impetus for immigrants to apply for citizenship, bring their families and permanently settle in the U.S. Fewer than 30,000 Greek immigrants arrived in the U.S. between 1925 and 1945, most of whom were "picture brides" for single Greek men and family members coming over to join relatives. 20th century In 1909, there was a pogrom against the Greek population in South Omaha. The events of the early 1920s also provided the stimulus for the first permanent national Greek American religious and civic organizations. In 1922, as a response to the anti-Greek campaign and actions of Ku Klux Klan, the American Hellenic Educational Progressive Association was founded, which sought to organize and Americanize the Greek immigrant in America. Greeks again began to arrive in large numbers after 1945, fleeing the economic devastation caused by World War II and the Greek Civil War. From 1945 until 1982, approximately 211,000 Greeks immigrated to the United States. These later immigrants were less influenced by the powerful assimilation pressures of the 1920s and 1930s and revitalized Greek American