在美国，政府建设了交通运输网络（州际高速公路系统 ） 、 大量补贴它们的建设（洲际铁路 ） ， 或在设计和早期开发中扮演基础性角色（互联网 ） 。
In the United States, the government constructed transformational networks (the interstate highway system), massively subsidized their construction (the transcontinental railroads), or played the foundational role in their design and early development (the Internet).