[Capsicum]

Does the Mexican/Puerto Rican line also reflect their relative share of immigration history by land vs. by sea?

The Southwestern Mexican communities and those of the Texas, Great Plains, Chicago I think had a land route (Chicago's early Mexican community in the 1910s came up from the southwest), whereas the Hispanics (including Puerto Ricans and others, both islanders and Central/South Americans) crossed the sea, naturally.

I'm also curious as to if Mexican communities in the East tend to be those who internally migrated from Mexican communities in the West/Southwest rather than independently moved from Mexico directly, by plane or sea.