First off, I'd much rather see the US putting trillions into clean power initiatives than effecting their dreams of manifest destiny abroad.
Secondly, I'd be interested to see the combined cost of all the coal and nuclear power plants across the US(including the cost of mining, processing, and dealing with the coal and nuclear fuel) along with the costs associated with road painting(one might be surprised at how much that costs) as compared to the projected costs of installing and maintaining these solar roads