Lies? The effort to divide the American electorate began in earnest during Newt Gingrich's tenure. Trump, however, is the first POTUS to refuse to even try to unite the Repub party, never mind the entire country, he is first to disparage the opposition as an existential threat, to deny reality (like the former president's citizenship, the size of crowds, the fact that he lost an election). If you believe they are an echo chamber of lies, make your case.
Here is the case for the U.S. trust deficit
Political scientists say that our confidence in our institutions—and in one another—is running perilously low. Economists see a different story.
www.newyorker.com
"Democracy’s most basic currency is trust, and, to judge by the usual indicators, we seem to be running out of it. Back in 1964, more than three-quarters of Americans said that they trusted the federal government; today, according to the Pew Research Center, only a quarter of Americans do. In the nineteen-seventies, Gallup found that around seventy per cent of people trusted the media; today, around forty per cent do. Even worse, trust in the media has become polarized along party lines. While three in four Democrats say that they trust the media, only one in ten Republicans would say so; as recently as 2000, the share among Republicans was one in two."
Americans also report having more animosity toward one another than they used to. Surveys by the political scientists Lilliana Mason and Nathan Kalmoe found that half of registered voters think that the opposing party is not just bad but “downright evil”; a quarter concur that, if that party’s members are “going to behave badly, they should be treated like animals.”