This chapter discusses how the scripts of blackness developed in tandem with discourses of race mixture that supported populist forms of governance and cultural policies in the 1940s and 1950s. The biological definition of Puerto Ricans as a mixture of three races—the Taíno, the Spanish, and the African—had been circulating since the nineteenth century in both criollo and U.S. writings about Puerto Rico, but before the 1950s, this was not institutionally constructed as an object of national pride. It was after the 1950s that the ideology of race mixture was taken up as a populist State discourse and implemented through the Institute of Puerto Rican Culture. Indeed, race mixture became a central part of the state's cultural program of development and modernization for Puerto Rico.