Heading into the next presidential election, an analysis of CNN polls shows that Republicans have reverted to the deeply negative national outlook they held prior to Donald Trump's presidential victory in 2016. They again are convinced the nation is in decline, and more often defensive against demographic and cultural changes in US society.

In a poll conducted late in the summer of 2016, following Trump's nomination, roughly half of Republicans and Republican-leaning independents (49%) said America's best days lay behind us. And while most said they considered the country's increasing diversity enriching, 37% said they felt the increasing number of people of many different races, ethnic groups and nationalities in the US was, instead, threatening American culture.