How and why has solidarity changed over time? Why have particular strategies, tactics, and strands of internationalism emerged or re-emerged at particular moments? And how has solidarity shaped the history of the US left in particular? In Solidarity, Steve Striffler addresses these key questions, offering the first history of US-Latin American solidarity from the Haitian Revolution to the present day. Striffler traces the history of internationalism through the Cold War, exploring the rise of human rights as the dominant current of international solidarity. He also considers the limitations of a solidarity movement today that inherited its organisational infrastructure from the human rights movements. Moving beyond conventionally ahistorical analyses of solidarity, here Striffler provides a distinctive intervention in the history of progressive politics in both the US and Latin America, the past and present of US imperialism and anti-imperialism, and the history of human rights and labour internationalism.