That may be but when federal money is involved, the federal government can specify certain conditions.<quoted text>
The states write the contract. Missouri claimed to be the first state to write an interstate highway contract. The states maintain them and police them. The interstate is a state toll road here, Pa., and Delaware. There is federal plans, money, and uniformity involved. The only thing new about them is the nonstop highway and speed about them. We've had Baltimore Pikes and Monmouth Pikes here since colonial times. Post roads in the constitution allowed for them.
The old interstates of the 1920s were roads like Rt-1 along the eastern seaboard.
When a bridge was repaired in California, local officials refused federal money in order to sidestep certain requirements like the use of US materials. Thy brought in a Chinese company to do the repairs.
In this manner, the federal government can specify a minimum wage for those working on that project.