Thomas P.M. Barnett : (2) " An economically confident America has – since becoming a world power at the start of the 20th century – tended toward global engagement. It is during times of economic stress (1930s, 1970s) that America has become more withdrawn. " - Thomas P.M. Barnett " There is no battle space the U.S. Military cannot access. They said we couldn’t do Afghanistan. We did it with ease. They said we couldn’t do Iraq. We did it with 150 combat casualties in six weeks. We did it so fast we weren’t prepared for their collapse. There is nobody we can’t take down. The question is, what do you do with the power? " - Thomas P.M. Barnett