First past the post is inherently undemocratic. Combine with the facts that Senate representation is based on lines on a map and not population, and House of Representatives representation is based on population numbers from a century ago, there's blatant gerrymandering to abuse the first past the post. Did you also miss the former president attempting a coup, getting away with multiple crimes while in office due to political affiliation? Or how about the fact that your supreme court wields enormous power and is blatantly political, with life appointments.

There's a bunch of reasons why the US is considered a flawed democracy, with the score going down every year, in the Democracy Index.