Sentence:  Nor have we remembered that in the melting pot of America the hundreds of isolated and semi isolated ethnic , regional and occupational groups did not fuse into a <WSD>homogeneous</WSD> national unit until long after education and industrialization had caused them to cast oral tradition aside as a means of carrying culturally significant material . 
Meaning of the word marked with <WSD> tags:  all of the same or similar kind or nature