The Spanish phrase "ciudadania gratis" translates into English as "free citizenship." It is commonly used in reference to the free citizenship lottery program that allows an immigrant to receive citizenship without the need to pay all of the associated fees or to fee study materials for the citizenship test.
When a person immigrates to the United States, she must first apply for a temporary visa that allows her to reside in the country legally. If she wishes to become a legal resident, she must pass a test proving knowledge of the country and pay associated fees. Many websites and organizations provide free study materials for this test and publicize them in non-English languages.