>>713538857
You should start seeing signs pretty early into the game. Like by the second mission when you have to cross into Mehico through Trump's never finished wall that the wetbacks never paid for. Structures? I think might be a while. First thing you should see is ladders or UPS drop off boxes by the third mission. I had to build a watch tower and timefall shelter before I saw any. I did see someone build a recharge station for my power bike towards the end of Mehico. That's like 5 or 6 missions in.