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Immigration to Ellis Island peaked between 1892 and 1924, during which time the 3.3-acre island was enlarged with landfill (by the 1930s it reached its current 27.5-acre size) and additional buildings were constructed to handle the massive influx of immigrants.
During the busiest year of operation, 1907, over 1 million people were processed at Ellis Island. With Americaâs entrance into World War I, immigration declined and Ellis Island was used as a detention center for suspected enemies.