From its beginning in 1775, the US Postal Service was based on the principle “that every person in the United States – no matter who, no matter where – has the right to equal access to secure, efficient, and affordable mail service.” A similar logic led to the expansion of the interstate highway system.
但在其他领域，这一问题还与公共政策有关。从1775年建立开始，美国邮政局一直基于“所有美国人&mdash;&mdash;不论是谁、不论身处何地&mdash;&mdash;都有权利平等地获得安全、高效、平价的邮件服务”的原则。类似的逻辑还支持了州际高速公路体系的扩张。