The new Statute of Autonomy of Catalonia, approved by referendum, was contested by important sectors of the Spanish nationalism and the conservative People's Party, sending the law to the partisan Constitutional Court of Spain which, in 2010, decided to declare nonvalid some of the articles that established an autonomous Catalan system of Justice, aspects of the financing, the status of the Catalan language or the references of Catalonia as a nation. As a response, on 10 July 2010, a successful demonstration was held, and the civil society started a process of organization in order to exert the right of self-determination. While the economic crisis affected profoundly Spain, CiU win the Catalan election of 2010, promising a fiscal agreement similar to the Basque. Its leader, Artur Mas, was appointed as president. Initially supported by the PP, his government carried out a program of austerity. During the National Day of Catalonia, on 11 September 2012, a massive demonstration in the streets of Barcelona organized by the organization Catalan National Assembly ("Assemblea Nacional Catalana", ANC) claimed for independence and a referendum of self-determination.