Mexicans, Puerto Ricans, and Salvadorians are the three largest Latino groups in the U.S. The Mexican diaspora, for example, accounts for 60% (35.8MM) of the USH population, of which only 32% were born outside of the U.S. We can infer that in this group 68% fall in the categories of US dominant and bicultural, so it is better to speak to them in English with some details of their culture.
The Puerto Rican diaspora accounts for 9% (5.4MM) of the USH population and although they are all U.S. citizens, they are predominantly bi-cultural and Spanish dominant. This group is followed by Cubans who account for 3.6% (2.1MM) of the USH population, of which 56% were born outside the U.S. and are considered Spanish dominant or bicultural. Finally, of the Dominican diaspora, which accounts for 3.2% (1.9MM) of the USH population, 54% were born in their country of origin, which is why they are Spanish dominant and bicultural.