"European plurality"
I don't think this sentence is accurate: 
"The majority of Americans descend from European immigrants who arrived after either the establishment of the first English colonies or the Reconstruction period in 1863–1877. This majority is expected to be reduced to only a plurality by 2050"

Are not most Hispanics descended fully or partially from Europe and speaking a European langauge? 
This sounds a little like the 19th cent. argument against the Italians, who are today considered white. The sentence at least needs to be more specific, that the anglo/germanic/southern europe majority will be a plurality.