一旦开始执政，所有美国总统很快就会意识到，他们的国内和经济决策权威受到国会和法院的约束，但在外交和国家安全事务上，他们的运作空间会大得多。
Upon taking office, all US presidents soon realize that their domestic and economic policymaking authority is constrained by Congress and the courts, but that they have much more sway over foreign and national-security affairs.