For both groups, the fact that Manzano, who holds dual citizenship, made a decision to show off the flags of both countries was a kind of signal to the people of Mexico that this accomplished young man hadn't forgotten where he came from.
As a quintessential science example, federal climatologist Ben Santer just published a pal-reviewed paper in the Proceedings of the National Academy of Sciences loudly proclaiming that the dreaded man-made global warming signal has emerged from our naturally chaotic climate.