Prajim Praiwet thinks he knows all about the U.S. and its wars. The 55-year-old Thai rice farmer remembers four decades ago when the jungles of his home province, Nakhon Phanom, were a key staging ground in American-backed efforts to eradicate communism in Indochina. Then a teenager, he watched in despair as a proxy war between the U.S. and China terrorized his little village: U.S.-funded Thai troops tortured and killed locals, while the communists responded by beheading Thai soldiers. "America will bully other countries because it is strong," says Prajim. "Everyone else will suffer."
This time around, the battleground...