The 1960s saw many significant global events including major earthquakes, wars ending, and the rise of popular music acts like the Beatles. Political instability occurred in countries like Brazil, Argentina, and Portugal during this transformative decade. Tensions rose internationally as well such as the Cuban Missile Crisis bringing the world close to nuclear war. Culturally, music evolved greatly as shown by the Beatles' albums Please Please Me and Sgt. Pepper's Lonely Hearts Club Band.