 The states with the largest Austrian American populations are New York (93,083), California (84,959), Pennsylvania (58,002) (most of them in the Lehigh Valley), Florida (54,214), New Jersey (45,154), and Ohio (27,017).This may be an undercount, as many German Americans, Czech Americans, Polish Americans, Slovak Americans, and Ukrainian Americans, and other Americans with Central European ancestry can trace their roots from the Habsburg territories of Austria, the Austrian Empire, or Cisleithania in the Austro-Hungarian Empire, regions which were major sources of immigrants to the United States before World War I, and whose inhabitants often assimilated into larger immigrant and ethnic communities throughout the United States.Before World War I, Austrian migration to United States was difficult to determine, as until 1918, it was only a small part of a multicultural empire.