The numbers tell the tale. In 100 years, between 1850 and 1950, some 4 million Irish came here. Some 6 Million Italians. Some 3 Million Poles. Perhaps 4 million Jews. Maybe 10 Million of everyone else, among whom were a lot of British.
Suppose some 50 Million in total came during that 100-year period. The Latinos have topped that number in just 40 years. They now outnumber African-Americans, and certainly every other distinct ethnic group.
Folks, this ain't a "Melting Pot," it's one big bowl of chili, in which ethnic groups other than hispanic hopefully can still just add a bit of flavor.
The "Latinos" are not one race or one culture for that matter. The fact is that over 60% of Latin American immigrants come from Mexico, whose culture was shaped by a mixture of the various Indian cultures mixed in with a bit of the European Spanish and, yes, los norteamericanos. Most Cubans who are here, in contrast, are largely of European cultural heritage, as the blacks and mulattos disproportianately stayed in Cuba. Argentineans are largely of European ancestry, while Dominicans are largely mulatto or black. Of course, none of this stopped the Irish/Italian YOKELS I grew up with from referring to Latin Americans as "Spanish," even if they were obviously Dominicans of African ancestry.