It's not a whitewashing that the description makes it out to be. Tocequville is working for the July Monarchy and so he was interested in how liberal democracy in America ~~suffered from~~ compared to the aristocratic structure of post-Napoleonic France. He admires the individualism of the frontier settlers while also pointing out that the US constitution has no actual mechanisms to enforce said liberal democracy when faced with an executive that doesn't respect the separation of powers.