> Because other races do not have such restrain and are out breeding white peoples
But, this is exactly what you would expect if you acknowledge that wealth is path dependent. If you start with a homogenus group of affulent people, and a much larger mixed group of poor people.
Since birth rates are directly affected by affluence, you have an affluent group of one race, whose birth rate pales in comparison to the poor, who may include people of the same race, but mixing them in with others..... yah sounds like nothing to see here at all.
The only thing this really proves is that the affluent are mostly the children of the affluent and the poor are, generation to generation, not climbing up the ladder... which, happens to correspond with a whole bunch of other realities, like that the future economic success of the children of middle class families is strongly influenced by whether their grandparents are also middle class.... those with poor grandparent are far more likely to end up poor themselves.
All you are seeing is the predictable result of economic inertia causing the affluent minority to act as a litmus for the lack of economic mobility.