White settlers who seek solidarity with Indigenous challenges to settler colonialism must confront how white supremacy shapes settler colonialism, our solidarity, and our lives. As a white person working in Canada and the United States to challenge racism and colonialism (in queer / trans politics, and solidarity activism) I am concerned that white people might embrace Indigenous solidarity in ways that evade our responsibilities to people of color and to their calls upon us to challenge all forms of white supremacy. This essay presents my responsibilities to theories and practices of decolonization that connect Indigenous and racialized peoples. I highlight historical studies by Indigenous and critical race scholars — notably, those bridging black and Indigenous studies — as they illuminate deep interlockings of white supremacy and settler colonialism. I call white settlers to become responsible to these, and related projects, so as to challenge the authority we might claim, or…