Sentence:  He has announced results on Hokan , Penutian , Uto-Aztecan , and almost all other <WSD>American</WSD> families and phyla , and has diagrammed their degree of interrelation ; but he has not worked out by lexicostatistics one comprehensively complete classification of even a single family other than Salish . 
Meaning of the word marked with <WSD> tags:  of or relating to the United States of America or its people or language or culture