Contrary to popular belief, the vast majority of undocumented immigrants inside the United States entered legal immigration status and then overstayed their status. Many enter as tourists, students, or non-immigrant workers. When their visa status expires, they simply remain in the United States and overstay their legal admission by months, years, or even decades. Thus making them undocumented or illegal. In some cases, the foreign national develops a relationship with a US citizen that leads to marriage. We discuss the process of going from a visa overstay to a green card through marriage here.