The lesson of the past several decades is that once Americans establish ourselves to assure security, we stay as long as it takes and then stay some more. World War II has been over for 67 years, but we still have 37,000 troops in Japan and 53,000 in Germany.
At one time, these forces could be justified as a counterweight to the Soviet Union, but the Cold War is ancient history. The Korean War ended in 1953, yet 28,500 American troops remain in South Korea.
Going over the fiscal cliff may not be good for the economy, but it might have one valuable result: forcing Americans to reassess our enormous defense budget.
Taking $492 billion away from the Pentagon over the next decade wouldn't be hard to do if we forced other nations to take more responsibility for their own defense -- and used the opportunity to reduce our overall troop strength. What's hard, and expensive, is our vast array of overseas commitments.
Why do we maintain these deployments? Partly out of inertia, partly out of a feeling they can't do any harm and partly from an incessant fear that anything that happens anywhere poses a potential danger to our security.
This last factor is hard to overstate. Earlier this year, Dartmouth College political scientist Benjamin Valentino constructed a poll that was carried out by YouGov. When respondents were asked if they think the United States "faces greater threats to its security today than it did during the Cold War," 63 percent said it does, with only 14 percent disagreeing.
"It's astonishing to me," Valentino told me in an interview in his campus office last month. Not only are we no longer under the constant threat of nuclear annihilation, he notes, but we have few actual adversaries. Many Americans are aware that we spend more on the military than the next 17 countries combined. What they may not realize, says Valentino, is that "of the next 10 biggest military spenders, all but two (Russia and China) are allies." You have to go to No. 25, Iran, to find a real enemy.
In world history, he says, "there is no precedent for the strongest power to have allies among so many other military powers. Russia and China are only quasi-adversaries." Iran and North Korea are military pipsqueaks, with or without nuclear weapons.