<P> The 1920s brought an age of great prosperity in the United States, and to a lesser degree Canada . But the Wall Street Crash of 1929 combined with drought ushered in a period of economic hardship in the United States and Canada . From 1936 to 1949, there was a popular uprising against the anti-Catholic Mexican government of the time, set off specifically by the anti-clerical provisions of the Mexican Constitution of 1917 . </P> <P> Once again, Canada found itself at war before its neighbors, however even Canadian contributions were slight before the Japanese attack on Pearl Harbor . The entry of the United States into the war helped to tip the balance in favour of the allies . Two Mexican tankers, transporting oil to the United States, were attacked and sunk by the Germans in the Gulf of Mexico waters, in 1942 . The incident happened in spite of Mexico's neutrality at that time . This led Mexico to enter the conflict with a declaration of war on the Axis nations . The destruction of Europe wrought by the war vaulted all North American countries to more important roles in world affairs, especially the United States, which emerged as a "superpower". </P> <P> The early Cold War era saw the United States as the most powerful nation in a Western coalition of which Mexico and Canada were also a part . In Canada, Quebec was transformed by the Quiet Revolution and the emergence of Quebec nationalism . Mexico experienced an era of huge economic growth after World War II, a heavy industrialization process and a growth of its middle class, a period known in Mexican history as "El Milagro Mexicano" (the Mexican miracle). The Caribbean saw the beginnings of decolonization, while on the largest island the Cuban Revolution introduced Cold War rivalries into Latin America . </P> <P> The civil rights movement in the U.S. ended Jim Crow and empowered black voters in the 1960s, which allowed black citizens to move into high government offices for the first time since Reconstruction . However, the dominant New Deal coalition collapsed in the mid 1960s in disputes over race and the Vietnam War, and the conservative movement began its rise to power, as the once dominant liberalism weakened and collapsed . Canada during this era was dominated by the leadership of Pierre Elliot Trudeau . In 1982, at the end of his tenure, Canada enshrined a new constitution . </P>

How did the early societies in central and south america develop