Mexico, is one the booming economy right now along with India, China, Brazil along with few other countries. Mexico have huge resources, they have just started drilling oil. Mexico is getting better everyday. Ofcourse it has some problems, but that can be easily handled, if US shows some real desire.

May be the thing is US is problem for Mexico, then Mexico being problem for US. It's because US was not able to control drugs sold in street, Mexico is suffering huge flow of black cash which cartel use to fight against Mexican authority. Cartel from all over the world make Mexico as gateway to billions of drug market, and Mexico have to use its resource to fight against it , rather then spending resource on other stuff. Now one more thing is popping up, because US, can't control it's unregulated workforce within US, human trafficker all over world are using mexico as it pathway to US. Now just because Mexico has border to US, it has to spend huge resource and life's fighting these cartel and traffickers.

So, the basic concept that always poor or undeveloped country is problem to its rich neighbour is completely flawed.

Regarding Nepal , it will get better, but we are loosing time, when whole world is moving very fast right now, we are stuck on this mess. 10-15 years of very good governance can easily transform Nepal. But problem is with people , we haven't even elected one party with majority to run government for years , how can there be stability.