" 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 It is during times of economic stress (1930s, 1970s) that America has become more withdrawn.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

The quote suggests that America's approach to global affairs is heavily influenced by its economic well-being. When the economy is strong, the United States tends to be actively involved and engaged on a worldwide scale. However, during periods marked by significant economic challenges or stress, such as in the 1930s and 1970s, the country becomes more inward-focused and less willing to participate extensively in global affairs.

The deep meaning of this statement lies in understanding how economic health shapes America's role and attitude towards international relations. When the economy is robust and growing, there tends to be a sense of confidence and willingness to take on leadership roles globally. Conversely, during times of economic hardship, there may be a retreat from these responsibilities due to domestic concerns and priorities. This pattern reflects a broader trend where national self-interest plays a critical role in shaping foreign policy decisions, often leading to shifts between periods of active engagement and isolationism based on the nation's perceived economic stability or vulnerability.

The quote is attributed to Thomas P.M. Barnett, an American author, military analyst, and professor known for his work on security studies and international relations. His insights are widely respected within academic circles and among policymakers due to their practical application in understanding complex geopolitical dynamics.