The dynamic political, economic, and social conditions of the post-World War II era, together with more activist US policies throughout Latin America, created new resistance to the United States in the 1960s. As in the early twentieth century, resistance leaders claimed that they needed to protect their national sovereignty and that Latin American values were somehow different from US ones. Often the forms of resistance mirrored those of earlier periods. Latin Americans worked to strengthen their position in regional organizations and they tried to wrest control of natural resources from US investors. But much was different. The success of Castro’s revolution in Cuba spurred new kinds of political violence, and Latin American governments were more successful in connecting their struggles to global movements.