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According to the Pew Research Hispanic Center, U.S. Hispanics of Salvadoran origin and U.S. Hispanics of Cuban origin each constitute a population of around 1.9 million. In fact, in a recent Pew survey, Salvadorans technically outnumbered Cubans, though by a difference not all that statistically significant.
Significance is found, however, in that U.S. residents of Cuban origin are no longer the definitively third largest American Hispanic group, a distinction held for several decades, per the Pew Research Hispanic Center.
Currently, per Pew, U.S. residents of Mexican origin total approximately 33.5 million, while those of Puerto Rican origin have a population of around 4.9 million.
Pew Research Hispanic Center: Salvadorans Replacing Cubans as 3rd Largest U.S. Hispanic Group?