I'm not American but having browsed Parler for say half an hour, if that is supposed to represent 'the other half', then I pray for the country.

I don't think American news media or academia or Silicon Valley skews left. It skews ... urban and educated? Silicon Valley seems libertarian-ish, news and media seems like they do in every other country. From here it doesn't even look like the US has organised, left-wing political actors.