Liberals want immigrants flooding in to exploit them. For cheap labor yes, but mostly for votes, in exchange for the welfare bribe. Look at the Clinton Archipelago voting map and you'll see why. They want to do some demographic cleansing.
That's what liberals do. If it's not rewriting history, brainwashing a generation with propaganda, trying keep criminals on the streets to disrupt civil order, or college age snowflakes recycling the 'don't trust anyone over 30' mantra to diminish more conservative older voters, it's flooding mass population into less voter friendly areas. Always something to wipe away the old order for the new majority.