In Third Worlds Within, Daniel Widener expands conceptions of the struggle for racial justice by reframing antiracist movements in the United States in a broader internationalist context. For Widener, antiracist struggles at home are connected to and profoundly shaped by similar struggles abroad. Drawing from an expansive historical archive and his own activist and family history, Widener explores the links between local and global struggles throughout the twentieth and twenty-first centuries. He uncovers what connects seemingly disparate groups like Japanese American and Black communities in Southern California or American folk musicians and revolutionary movements in Asia. He also centers the expansive vision of global Indigenous movements, the challenges of Black/Brown solidarity, and the influence of East Asian organizing on the US Third World Left. In the process, Widener reveals how the fight against racism unfolds both locally and globally and creates new forms of solidarity. Highlighting the key strategic role played by US communities of color in efforts to defeat the conjoined forces of capitalism, racism, and imperialism, Widener produces a new understanding of history that informs contemporary social struggle.