They are both true too. The government's involvement with the early history of silicon valley prompted the need for more buildings, which these guys supplied.

They are both true too. The government's involvement with the early history of silicon valley prompted the need for more buildings, which these guys supplied. I mean they were smart, they saw a demand and filled it, and then they got lucky when silicon valley became massively successful. I think the more interesting thing is that they are using slightly different connotations of the word built. The government "built" silicon valley as a conceptual place. And these guys literally built it.