Ah, but in addition to a common language and ethnicity, we also share those other gifts of the British Empire bequeathed to the white colonies, including the USA, that of a strong rule of law, a lack of overt political corruption, excellent economic foundations, strong Protestant work ethic (laugh now, but the PWI told its followers that only through building great works could you obtain salvation, which is why the Scots built much of the world's infrastructure and tech) and a cold climate that made the original settlers work hard or die.
Mexico, had all the opportunities as the USA, as she also wrestled independence from a European power. However Mexico has a weak rule of law, suffers from overt corruption, has a Catholic (salvation through prayer and money alone) work ethic, and a warm climate where you could be idle and still live throughout the winter. Even the mother country Spain was in the third-world sh#thole until she joined the EU. In fact, every country south of Texas is a mess for much of these same reasons.
