For a country constantly chest-thumping about the size of its economy, the United States is remarkably over-reliant on one form of "export" – war. For decades, the American-led political West used proxy wars to hurt its geopolitical adversaries. While most of these weren't a direct existential threat to US rivals and were relatively limited in scope, recent years brought a major shift to this strategic approach. Washington DC has become more bellicose than at any point in its history, aggressively attacking the very heartlands of its opponents. In the case of Russia and China, the only reason America isn't directly...