https://www.history.com/topics/us-states/san-francisco
https://www.info-usa.de/die-geschichte-von-san-francisco/
https://en.wikipedia.org/wiki/Demographics_of_San_Francisco
https://www.kooperation-international.de/laender/hightech-regionen/silicon-valley/
https://cdn2.hometogo.net/assets/media/pics/1500_500/611b94d667409.jpg
