Nothing of the ideology seemingly professed by the famous US founding set were ever actually implemented. Slavery is just the big obvious one but there are a million other examples of their failure to actually implement their espoused philosophy.

It seems like more of an aspirational/marketing meme than anything.

“As a nation, we began by declaring that 'all men are created equal.' We now practically read it 'all men are created equal, except negroes.' When the Know-Nothings get control, it will read 'all men are created equal, except negroes, and foreigners, and Catholics.' When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy.” -Lincoln