Uber rapidly expanded from its founding in 2009 in the United States to over 65 countries and 570 cities globally by 2012-2013. Using an innovative strategy of operating as a transportation network without owning vehicles or directly employing drivers, Uber was able to double its revenues every 6 months. However, Uber's aggressive expansion tactics and controversial practices have led to increasing lawsuits, bans in some areas, and conflicts with regulators and the taxi industry.