A bipartisan bill on U.S. border enforcement—which Joe Biden endorsed as the “toughest and fairest” set of reforms in U.S. history—recently failed in the Senate, suggesting the issue will remain a flashpoint ahead of elections this fall. This week’s reading list examines the fraught history, politics, and ethics of the border—from Harsha Walia on what talk of a “migrant crisis” gets wrong to Joseph Carens on citizenship and belonging, Mae Ngai on what a better immigration debate would look like, and Greg Grandin on American extremism.