2. We would lose about 90% of the blacks and 60% of the Hispanics in the USA. This would be a major blow to the NFL, NBA and MLB. However, it would also pretty much end the illegal immigration problem, cut down on unemployment, welfare and foodstamps. Overall a PLUS.
I know just as many white people "living off the system" as the groups you mention...farmers are one example....where else can you get paid to let you land sit idle?