I got some advice for you. Learn to think because just because the law didn't actually ban immigration doesn't actually mean that it didn't have an affect on it. You really are trying circumnavigate the more complex idea by disproving the not so complex statement. The law didn't actually ban immigration directly but who it kind of makes sense that if you make it harder to become a citizen and pair it with a law that allows you to deport non-citizens then wouldn't immigration be kind of stiffled to a certain degree?