Most the best land for solar farms in the west half of the US is controlled by the federal government. https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Ma...
For example, there basically will not be large scale solar in Nevada, Utah, Arizona, etc under this administration. You know, some of the highest value spots.
Iowa choose wind because 20 years ago it wasn't an issue and someone put in a clause that made building wind an advantage to utilities so they tried. By the time wind became an issue elsewhere there was too much installed in Iowa for anyone to be able to claim it couldn't work and in turn those who made it political have to be quiet about it when they come to Iowa.
Nevada, Utah and Arizona are all low population states with little power demand. While power can be shipped that needs power lines and other complexity. There is a lot of solar potential there, but the lack of demand means they are not highest value.