RE: could have built a lot of wall, given vets concurrent receipt, funded cancer research etc.
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True.
If we, instead of the DC elites had the power to choose we might have chosen that and other things such as:
Hardening the grids against EMP and other attacks or sabotage.
Converting large segments of the power grid to underground lines to avoid deadly power outages such as during cold weather and tornadoes and flooding.
And on and on.