Culture and politics and probably in Mexico a stranglehold by the very rich on the government so they can maintain their lifestyles of the rich and famous. I used to vacation down there - the poverty was hard to take. Would buy things from them I didn’t need. I suppose the rich in Mexico are grateful to be able to send their impoverished minions to us rather than face a revolution.
One thing about the Japanese, they are hardworking and have a sense of shame. Not sure I could say that about Mexico in general - not to mention the gimmedats here in the US.
I’m pretty sure the Japanese don’t allow illegal aliens to sneak in and become Japanese citizens, either. Come to think of it, I think they make it very difficult for legal immigrants to come in and become Japanese citizens. It kinda helps them avoid culture wars.
http://www.justlanded.com/english/Japan/Japan-Guide/Visas-Permits/Japanese-citizenship
According to the Japan Times: “In 2010, 13,072 citizenship applications were approved with just 234 rejected”. 13,072, and look at the requirements!
Of course, the open border globalists insist that Japan is dying. Maybe so, but if they import 10, 20, or 30 million non-Japanese to keep the place growing, is it really even Japan anymore? The same can be said about the USA. If we keep importing millions upon millions from cultures that are antithetical to traditional American values of self reliance, small government, and liberty, will this still be America?
On the other hand, all that mass migration seems to be working well for nations like England and France. You can see how they’ve become economic and cultural powerhouses for it...