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Most Americans think that the country is politically divided and polarization will only get worse, not better. Such perceptions of polarization are widespread, but we do not know enough about their effects, especially those unrelated to political variables. This study examines the consequences of perceived polarization for levels of social trust in the United States. Trust in fellow citizens is the backbone of a well-functioning democracy, given its role in promoting social cohesion and facilitating collective action. Using nationally representative panel data, as well as an original survey experiment, I find that perceived polarization directly undermines Americans’ trust in each other. A belief that members of society share common values fosters social trust, but perceptions of partisan divisions and polarization make people less trusting of their fellow citizens. Due to perceived polarization, people are less likely to believe that others can be trusted to do the right thing, which in turn decreases their willingness to cooperate for good causes. I discuss the implications of these findings for society’s ability to work together toward common goals. Supplementary Information The online version contains supplementary material available at 10.1007/s11109-022-09787-1.

When forming opinions, mass publics may implicitly or explicitly value some people’s well-being more than others. Here we examine how two forms of this phenomenon—ethnocentric valuation and moral exclusion—affect attitudes toward international trade. We hypothesize that attitudes toward competition and believing that trade is a competition moderate the extent of ethnocentric valuation and moral exclusion; although all citizens value their co-nationals’ livelihoods systematically more than those of people in trading partner countries, greater ethnocentric valuation and moral exclusion occur when trade is seen as a competition and when individuals hold more positive attitudes toward competition. Using two survey experiments conducted on representative samples of both Americans and Canadians, we examine how differential valuation of in-country and out-country job gains and losses influences trade policy preferences. We test a series of hypotheses using multiple variables tied to competitive attitudes across two countries that differ in their attitudes toward competition.

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