Can you elaborate on this? Surely you don’t mean only white people can form/sustain liberal democracies…
On a surface reading that's exactly what it says.
And yet here we have a whole bunch of white guys tearing up the Constitution.
Sad but true. White (western European) culture built these institutions and nonwhite cultures will have a hard time upholding them in their current form, if they even wanted to.
I don't think this is related to what's currently happening with Trump, however. That's a separate thing, more of a populist backlash by whites for various reasons.
It is interesting to note Liberia has(had) a similar constitution, although they seem to have done better at preserving freedom, and overall a quite different result in what they've got. You can build a house without code psychopaths condemning it because you broke some silly rule, you can raise your children mostly as you see fit without fascist CPS agents who pretend to be the ultimate parent scrutinizing you, they do not have much of any functioning immigration police, not much of any enforcement on the "war on drugs", the government is overall a pretty low % of GDP, and they only have 10% the amount of prisoners per capita as the US.