As immigration to Europe has increased, so has support for extremist parties. While many studies have examined the effect of immigration on election outcomes, few have probed the effect of asylum seekers – those fleeing strife and persecution – on voting, nor has there been much research on...

Drawing on panel data from six elections between 1998 and 2017 in Germany, we estimate the causal effect of immigration – described by Germany’s interior minister as the "mother of all political problems" – on electoral support for the far right and the far left. Our identification...