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During the Progressive Era, which spanned roughly from the late 19th century to the early 20th century (approximately 1890 to 1920), a significant number of immigrants came to the United States from various parts of Europe. The majority of immigrants during this period came from countries such as:
1. Southern and Eastern Europe: Many immigrants arrived from countries in Southern and Eastern Europe, including Italy, Greece, Poland, Russia, and the Austro-Hungarian Empire.
2. Asia: Immigration from Asian countries, particularly China and Japan, also contributed to the demographic changes during the Progressive Era, although Asian immigration was restricted by legislation such as the Chinese Exclusion Act.
3. Ireland: While immigration from Ireland had been substantial in previous decades due to the Irish Potato Famine, there continued to be Irish immigrants during the Progressive Era.
It's important to note that immigration patterns during this time were influenced by various factors, including economic opportunities in the United States, political conditions in the immigrants' home countries, and changes in immigration laws. The Progressive Era was characterized by efforts to address social and political issues, and the influx of immigrants played a role in shaping the diverse fabric of American society during this period.