Is Federal Infrastructure Spending Unconstitutional?

So what was the understanding in 1787-90? I have pieced this together over many years. In a nutshell, here it is:
Obaminable Nullification & Division Among Constitutionalists
“Progressives” often attack as indefensible proposals by some conservatives that states nullify federal laws those states deem unconstitutional. But “progressive” politicians now are engaged in a nullification campaign far more audacious and lawless than anything suggested by conservatives. The latest example is the decision by Virginia’s new attorney general, Mark Herring, to join the attack […]