Getting married or divorced may change the wait time for a green card for some Illinois people. This was the case for one man whose mother, a U.S. citizen from the Philippines, had filed an immigrant petition for him in 2005 when he was unmarried. As the unmarried adult child of a citizen, this placed him the category "First Preference".
When people in Illinois talk about getting a "green card" in connection with immigration, they are referring to the process of obtaining permission to live in the United States as a permanent resident. This can be a complex process that differs greatly depending on a person's status.