The 1986 amnesty legalized at least twice as many as we were told it would, largely because of fraud and the inherent difficulty of knowing how many illegal aliens there were really are. It's now easier to get fake documents so we can bet any amnesty this time would be a doozy, especially since this administration won't want to reject anyone. Congress can't even get figures on Obama's pseudo-amnesty, DACA, and it's rejections, if any. The 1986 amnesty also gave a handful of countries a lock on our legal immigration. Mexico alone now accounts for 15-20% of it.