因为美国的正客们为了获得选票和正治团体的赞助已经侵蚀了税收的基础，以至于基本的基础建设（还有其他基本的服务，如教育和医疗）不能再得到充足的拨款。一个令这种情况雪上加霜的事实是，在过去16年中，华盛顿正*府一直因两檔不能同时控制总统和立法机关而陷于瘫痪。
Joel Phelan Former USMC NCO and Veteran Programmer Wiggin Libertarian
Answered 17h ago
Joel Phelan 前美国海军陆战队士人，资深程序员，维京的自由主义者
It’s because they started building their infrastructure about 80–100 years AFTER the USA did. Thus the engineering was standardized (mostly by the USA) material costs were down and technology existed that they could reasonably implement that the USA cannot without having to tear out the OLD infrastructure (and as another person answered much of the US’ spending is in maintaining the existing infrastructure roads bridges and train tracks where as China because they (comparatively) have nothing and had almost literally nothing in the way of modern infrastructure 30 years ago did not have these maintenance costs. It’s a problem they will run into going forward.