Austin became the #1 entrepreneurial city through a multi-step incubating process over several decades: 1) Large tech companies like IBM established operations in Austin in the 1980s, attracting talent. 2) Employees from these companies went on to found startups of their own, spinning off 29 companies from IBM's Tivoli division between 1989-1996. 3) These new companies and their employees further spawned new startups, nurturing a culture of entrepreneurship and continuing the cycle of new venture creation that made Austin a hub for technology and startups.