You think some wall money is going to crash Mexico? It's already crashed.
They have Marxist rebels in Oaxaca, in the south.
The North is a hell-hole. The Cartels rule there through terror, they assassinate anyone who gets in their way in broad daylight, including judges, police chiefs, journalists and even normal everyday people who are overheard saying the wrong thing. Their little gang, the zetas, has even been kind enough to bring the fun across the border into our country.
Mexico City is the venture-kidnapping capitol of the planet...but you're worried about money for the wall, you think that's what's going to break Mexico?