Original sentence: Large scale Ukrainian immigration to America did not begin, however, until the 1880's.Many Ukrainians are foreigners, the largest wave of Ukrainians came in the early 1990's, after the fall of the Soviet Union
Edited sentence: Large scale Ukrainian immigration to America did not begin, however, until the 1880s.Many Ukrainians are foreigners, the largest wave of Ukrainians came in the early 1990s, after the fall of the Soviet Union