Covered the run-up to IRCA in '86. Enforcement-only bills without an accompanying legalization pathway have failed to actually reduce unauthorized immigration every single time we've tried it since. History on this one is pretty clear.
On washingtonpost.com — see it on the live page
Respectfully, the '86 amnesty is a big part of why we're back here arguing about this again. "Do it once more but bigger" isn't obviously the lesson to take from that.