By Brian Winter SAO PAULO (Reuters) – Angered by reports that the U.S. government spied on her and other Brazilians, President Dilma Rousseff is pushing new legislation that would seek to force Google, Facebook and other internet companies to store locally gathered data inside Brazil. The requirement would be difficult to execute, technology experts say, given high costs and the global nature of the Internet. Still, Rousseff's initiative is one of the most tangible signs of a backlash following revelations that the U.S. …