I've just recently found out about the history of black people in Mexico, today I also learned that Japanese people have also migrated to Mexico centuries ago and to this day there's still a state were there's mostly Japanese people living.
I'm Mexican and they never teach this things in school and I'm very curious on just how many types of people we have, but when I try to look it up I only get mexicans leaving to other countries.
Anyone has any information on this or could tell me zwhere to look it up?
Great question! You're absolutely right, these African and Asian heritages are still way too often overlooked today, in Mexico and Latin America. I'd say this has much to do with the ongoing discrimination against those groups and their descendants.
I've written à few longer answers on these topics on here:
On Asians - briefly, most early migration came from the Spanish Philippines. There were early Japanese diplomatic voyages, but the larger migration kicked off in the late 19th c :
While not directly on your question this one on Spanish migration seems relevant:
They all feature reading recs but if you're looking for something specific let me know!
Before the XIX century New Spain was the most developed "nation" of America and it was quite attractive for that reason, the ports of Acapulco and San Blas were essential for travels to Asia through the pacific, and as the other comment said, there were some Japanese connections with Japan, China, and New Spain before the independence war, there has always been a lot of mobility in the Caribbean too all the way from Quintana Roo to Veracruz. If you want to read more about the economics aspects of this I recommend you to read J. H. Coatsworth.
More recently there have been waves of immigrants, particularly refugees, to Mexico all through the last century, one of the most notable ones is of Spanish exiles during the Franquist regime, Cubans that fled after the revolution and during Batista's regime, Chileans that fled from Pinochet's regime and Argentinian's from Videla's regime, Mexico has been the refuge for those displaced by regimes in the Spanish-speaking world for a long time. It received a lot of refugees from the world wars (like Elena Poniatowska from the last royal Polish family) and from several wars int he middle east, especially of Jewish and Christians from now Turkey, Syria, Lebanon. I'll look for some sources but I assume most will be written in Spanish.