Population structure of US Hispanics
As I explain here, ADMIXTURE increases the proportion of the "native" component in the absence of pure-blooded representatives of the indigenous inhabitants. Since the Taino are extinct, the "Native American 3" component is actually a hybrid of the Taino aborigines and Europeans.
PLoS Genet 8(4): e1002640. doi:10.1371/journal.pgen.1002640
Population Structure of Hispanics in the United States: The Multi-Ethnic Study of Atherosclerosis
Ani Manichaikul et al.... [via Dienekes]