Well, why stop there?
Let's go back to the Immigration and Naturalization Act of 1965.
The sanctuary cities nonsense of the 1980s had more to do with the various adjuncts of the Cold War being waged in Central America than they did with Illegal Aliens in general. Obviuously they were wrong, but just abviously those Illegals who came into the sanctuary cities were eligible for the 1986 Amnesty, which for all intents and purposes wiped the slate clean of Illegals.
Virtually all of the Illegals we're now dealing with came in subsequent to the 1986 Amnesty, and it is their nearly universal hope when they come that there will be another Amnesty someday.
This avalanche, the one we now face, was started by the bipartisan 1986 Amnesty.