IMO, Mexico City isn't really a good comparison to any U.S. city because Mexico is still a relatively "poor" country, and the reason most folks take transit is because they can't afford a car.
Their ridership stats are pretty much irrelevent as a basis of comparison, because they're just a barometer of poverty, rather than whether the Metro is efficient or whatever. If there were no Mexico City Metro, you would probably have the exact same ridership, but now riding on buses.
Most of the Latin American cities have very low "choice" riders on their transit. So they have tons of overall ridership, but anyone who can afford a car buys one and chooses to drive. It's an important marker of social status.
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