The fear (for some) in 1916 was the rise of German-Americans as a voting block, and other immigrant groups who were known as the “hyphens” after the hyphens between their original nationality and the word “Americans.”
The 2016 election was no different, as it was expected that everyone from Mexican-Americans to Asian-Americans might reach record high levels of turnout. The Hispanic population did make up about 11 percent of the electorate, up from 10 percent in 2012 and 9 percent in 2008, but even that 11 percent was less than many analysts expected given their surging population.
The Hyphen Vote Was Practically a Myth: With the Possible Exception of Oregon, the German-American Vote Was Not an Election Factor Anywhere in the United States
From November 19, 1916