The fracking revolution, widely viewed as originating in the US, has helped to lower energy prices and has eliminated America’s dependency on foreign oil. Likewise, much of the rapid advance in communications in recent years reflects innovations – smartphone and tablet hardware and software, for example – that has been indigenous to the US.
相反，如今美国经济显而易见的相对强势也许反映了某些最近表露无遗的鼓舞效应。被广泛视为美国原创的液压致裂革命帮助降低了能源价格，让美国不再依赖外国石油。类似地，近几年来通讯业的快速发展体现了美国本土的创新——比如智能手机和平板电脑软硬件。