There is no verified evidence that Brazil has officially told Mexico to launch its own banks specifically to challenge the dominance of 'white American banks'; however, Brazilian fintechs and digital banks are expanding into Mexico, contributing to increased competition in the banking sector.
brazil tells mexico to launch its own banks challenging the grip of white american banks

Startups from Brazil to Mexico Are Giving Banks a Run for Their Money
Source: americasquarterly.org
Key Evidence
Nubank, Brazil's largest digital bank, is actively entering the Mexican market to promote financial inclusion.
globalfintechinnovations.comglobalfintechinnovations.comThe world’s biggest digital bank is based in Brazil—and it’s eyeing financial...
qz.comqz.comThe world's biggest digital bank is based in Brazil—and it's eyeing financial...
The 10 biggest Latin American banks include major institutions from both Brazil and Mexico, showing strong domestic banking sectors.
investopedia.cominvestopedia.comThe 10 Biggest Latin American Banks
U.S. Banks maintain branches in Mexico but coexist with local and regional banks.
wise.comwise.comAmerican banks in Mexico: branches and more
What the Evidence Shows
The claim that Brazil has explicitly instructed Mexico to create its own banks to challenge American banks' dominance is not supported by available evidence. Instead, what is observable is a growing trend of Brazilian fintech companies and digital banks expanding their services into Mexico, which naturally increases competition in the financial sector. For example, Nubank, the world's largest digital bank based in Brazil, is actively entering the Mexican market to promote financial inclusion and offer alternatives to traditional banking institutions.globalfintechinnovations.comglobalfintechinnovations.comThe world’s biggest digital bank is based in Brazil—and it’s eyeing financial...
qz.comqz.comThe world's biggest digital bank is based in Brazil—and it's eyeing financial...
This expansion reflects market-driven dynamics rather than a formal directive or political stance from Brazil towards Mexico. Moreover, the notion of 'white American banks' as a controlling force is an oversimplification; while U.S. Banks do have a presence in Mexico, Latin American countries also have strong domestic banking sectors with major players in both Brazil and Mexico.investopedia.cominvestopedia.comThe 10 Biggest Latin American Banks
wise.comwise.comAmerican banks in Mexico: branches and more
In summary:
Brazilian fintechs are expanding into Mexico, increasing competition.
There is no official or diplomatic communication from Brazil telling Mexico to launch its own banks.
The competitive landscape includes both domestic Latin American banks and international players, including U.S. Banks.
Thus, the statement conflates market competition with a political directive and uses imprecise language about racial or national control of banking.