Well, a huge part of our economy would collapse.

A huge chunk of the export of goods and labour from “non-white” countries would obviously stop. Just imagine how many companies would be robbed of their outsourced IT. Clothing made in southern Asia. Metals from Africa. Oil. Cheap off-season produce. The list is long.

On the other hand, their absent imports would ruin, for instance, farmers whose income depends on the export of grain. Many of the net importers of food are “non-white” countries, so that would be one market breaking down.

Even if we disregard the personal loss, the economic implosion would rapidly have us turning on each other in a panicked attempt to secure a future in the unpredictable upheaval.