sentences:  Immigrants poured into the area from all over Central and Eastern Europe (supplemented by a small Mexican immigrant community) and from many regions of the United States, such as Appalachia and the South.By 1930, Lake County's population surpassed 260,000, with first- and second-generation Americans constituting a majority of the population.Like the rest of Indiana, the Ku Klux Klan gained a large following in the 1920s in response to changing demographics.