The author sounds like he is soothing his readers into believing nothing can change.
America was built; wasn’t it?
Like Britain after the second world war, it needs to be re-built. Creative destruction is good, but Churchill with all of his rhetorical gifts and good sense was either too preoccupied or just unable back then to make a convincing case for the UK rebuilding itself. And so war-weary Brit voters went with what they perceived to be a known quantity: Attlee. American voters were a little more carefree and went with the incumbent (Truman) until he wore out his welcome (just like Attlee did but for different reasons).