You say this as if it's fast or easy. All of these can easily take 10s of years build from conception to completion due to a myriad of reasons. Land acquisition, federal state and local funding, environmental review, court cases, zoning changes, public review proceses, etc. It's not like someone decrees that a school should be built and 6 months later it's up and running. And the school is the easy one on that list :)