Nah...
As a Mexican born, U.S. Citizen I often grappled with the "injustice" of how a fake skirmish across the Nueces River led to the U.S. Army march upon Mexico City and the theft (for a petty sum of money) of the land that now comprises the States of California, Utah, Nevada, New Mexico, Colorado and parts of Oklahoma and Texas (this after Texas 'won' their own independence from Mexico via "a glorified militarization of squatters"). More so when discovering that the U.S. Government already knew that gold existed in California (before the famous find at Sutter's Mill). However, when I matured enough to understand that history is very complex and not always "black and white" it dawned on me that under U.S. sovereignty those states were actually allowed to prosper. Think about that for a second.
If they had stayed under Mexican sovereignty - in a hypothetical alternate timeline - there is no way that the resources would have been managed with the same level of stewardship. Said resources would have been squandered by the same crony types that have squandered the great resources in Mexico. The lands would be overrun by drug cartel mafias today. The land itself owned by the "political nobility" and their descendants.
You see (and I've said this before on plenty of occasions), I absolutely love Mexico: its history, its folklore, its rich cuisine, its music, its sights, its beaches and mountains, its weather, its art and architecture, its people and its culture. You even know that I happen to cheer their fútbol teams over any other nation's, including the U.S. You know what I absolutely despise though? I hate Mexico's brand of government. Its socialist inclinations are what have wreaked havoc upon the Mexican people over the past several decades to the point where they have been forced to emigrate into the U.S. seeking better opportunities. Meanwhile the crony thieves (otherwise known as Mexican politicians) have reaped the benefits of this dynamic. From their vantage point when more people leave the country then they are able to steal more money from the land and have to manage less people. So they inherently have no vested interest in preventing the mass exodus (especially when many of the migrant families that work in the U.S. send billions of dollars back to Mexico - which of course gets funneled back to the government via ridiculous taxation rates, and back to the pockets of the politician-thieves via egregious loop holes).