American Indian Nation “A” exercised its sovereign authority to license on its reservation the ﬁrst-ever retail bank branch. The bank is owned by American Indian Nation “B,” which also makes it the ﬁrst modern foreign-owned investment in Nation A. We conduct a ﬁrst-of-its-kind survey of Nation A’s tribal members in the months before the bank’s groundbreaking. This unique opportunity allows us to investigate drivers of individuals’ support for and, crucially, willingness to become customers of the bank. Without deception, we explore effects of the bank’s Native identity, as well as randomized interventions communicating support from the Nation A government and the Federal Reserve System. We ﬁnd widespread approval for the branch but at times counterproductive effects of the interventions, complicating the developmental promise of this instance of economic integration. Throughout, we advocate for the theoretical importance of American Indian nations as sovereigns making choices in international economic relations.