In the second half of the twentieth century, the US showed that committed leadership could help to ensure widespread stability and prosperity. In the twenty-first century, it has showed how devastating a lack of such leadership can be.
二十世纪下半叶，美国证明了全力以赴兑现领导力能有助于确保广泛的稳定与繁荣。在二十一世纪，美国又证明了缺乏这一领导力所能造成的灾难性后果。指责游戏无助于解决问题。下一届美国政府只有追求真正的深度可持续合作——不管在国内还是国外——才能确保未来几年会比过去几年更好。