California High-Speed Rail, 520 mi in length, began construction in 2015, cost 90x as much per mile, even after accounting for inflation, and.... was indefinitely postponed in 2019. For a rail line in a single state.
Admittedly, with much higher speed, and much more humane construction. But nonetheless, even with a much higher per-mile price they still couldn't deliver it? I can see how someone someone might get the impression we aren't able to successfully deliver large projects any more.