Marriage allows the foreign spouse to apply for a Green Card and seek permanent residency. Why It Is Popular 90 Day Fiancé is about the American dream | Vox

The flagship series follows couples who have applied for or received a , a legal permit that allows the foreign fiancé of a U.S. citizen to enter the United States.

Once the foreign partner arrives, the couple has exactly 90 days to marry.

If they do not wed within this window, the foreign partner must leave the country immediately.