You can't prove that racism is behind Trumps election. Its much more complicated.

 Trumps election is a sign of America's moral strength.  Americans want to preserve their culture of Liberty. They are resisting the Liberal belief in Secularism with its moral relativism and inherent atheism and materialism. They are resisting the destruction of the family, which again is a moral position. Trump supporters want the Liberal control of the mass media weakened so that traditional moral values and ideals can have equal footing. 

By electing Trump Americans asserted a desire to stop the deep corruption that penetrates every level of government. Trump supporters desire a return to the "rule of Law" which is a moral precept itself. 

To have elected Hillary would have been a sign of moral weakness. For everything the Democratic party represents involves moral decline.