The route you must take to obtain a green card through marriage can be a convoluted one for many people. There are a tremendous number of people who marry a foreign-born person and apply for permanent residency through a green card. Government statistics indicate this number to be about 450,000 people. As you can well imagine, because of the large number of people applying and the unlimited numbers that can be granted, the process can be time consuming, costly and mystifying. To assist you, there is a step-by-step marriage immigration guide to help you file for your Green card application. This guide is available through the United States Citizen and Immigration Services(USCIS).