We can start with the Electoral College. It was created so states with more black slaves than white people have power over states with fewer black slaves and more white people. It is still protecting white supremacy today. Trump would not be president with out it. Another is the 2nd Amendment. This country would not exist without it. You can't build a nation on ethnic cleansing and race based slavery without murder on a massive scale.  The army was too small for fast responses to slave revolts thus the need for "a well regulated militia".  White men can walk into a luxury hotel with an arsenal without question yet black folks are killed for mere suspicion of being armed. Then we could add gerrymandering that allows the GOP to dominate Congress with fewer total votes than Democrats. Then there is the practice of racial profiling. It is practiced in many forms in all our institutions to one degree or another. I could go on.