Don't forget that the companies made billion dollar investments into those facilities, expecting to recoup that investment over time. A US-based company was interested in building a LNG plant in Peru but is worried about the outcome of the Peruvian elections, of which Chavez keeps sticking his nose in.
Unfortunately, the companies will probably capitulate and run the plants while giving huge chunks of money to the leftist governemnts. If the companies had some backbone, they should shut it down, refuse to sell spare parts, etc, and good luck to the Bolivian "engineers" to run the company. Many of the national oil company "engineers" (PDVSA, Sonatrach, etc) are only in the positions because of nepostism. They are useless.
People should also keep China in mind. Companies constantly move operations to China for cheap labor. China sits quietly building its economy and its industry. We keep giving ours away. China knows that it is now still weaker, but it is waiting patiently. At some time in the future, China will nationalize all of its foriegn-owned industry, leaving America with serious problems.