There will be no revolution, the black segment has already been replaced by the hispanics as a voting block to be catered to. The white americans will also become a minority of insignificance at election time, and certainly in no position to start a revolution - they will be so outnumbered by the year 2100, that it would be a joke. The old European customs and religions will die off in America along with the old white guys.
Massive immigration keeps prices low, profits high, and labor cheap. The true price of labor, is far far below what our previous closed economy used to have to pay. American companies no longer have to pay an inflated wage, and they wont. No company in their right mind will pay more than the world price of labor. In all likihood, unions will all but disappear except for the service industry, e.g. teachers, police, etc, and manufacturing will soon disappear entirely from the American continent.
There are hundreds of millions of workers in INdia, China, Mexico, and Eastern Europe that are ready and willing to take the jobs that Americans do not want. The Republicans and the Democrats are both for huge increases in immigration to take these jobs. The immigrants seem to have no problems at all finding plenty of work, thousands of them come here each day , each week, each month, day in and day out. By 2050, with current trends continuing, America will have 400 million people, and by the end of the century it will have a billion.
There are currently only a very few people who want to change the way we are headed, and each year they are even more outnumbered. The days of young americans earning $100,000 are gone forever.