Within a single generation. My grandfather showed up here at 11 from Romania. Never became a US citizen. His son, my father, is a rabid anti-immigrant racist Fox News fan boy. It's disgusting. Ironically my mother's great-great grandmother lost her birthright citizenship by marrying a Finnish immigrant before the 14th amendment existed and had to reapply for her own citizenship along with her husband because women's status was tied to the male head of household at the time, and now he rants about how birthright citizenship is wrong, despite being the exact person who benefits from it.