ABSTRACT This paper explores the emergence of far-right extremism within local political institutions in the United States. Building on theories of intergroup contact and group threat, I hypothesize a set of community socio-demographic conditions which may foster public support for far-right extremism, and test these using a database of county sheriffs who aligned themselves with the constitutional sheriff movement – a movement closely tied to white nationalism – between 2012 and 2022. Findings offer support for both contact and threat dynamics; however, which relationship prevails depends on a novel optimal contact condition, where the likelihood of a constitutional sheriff is highest at particular levels of demographic diversity. Additionally, results indicate threat dynamics sourced from economic status, but opportunities for positive outgroup interactions and faster demographic diversification appear to build resilience against extremism. Notably, all identified associations are driven by racial rather than nativity-based dynamics, which I suggest is likely due to the nationalization of anti-immigrant narratives inducing perceived, over experiential, threats. These findings have important implications for understanding the local dynamics of far-right extremism and the infiltration of fringe ideologies into political institutions.
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