What did World events in the late summer and fall of 1949 caused?

In the late summer and fall of 1949, significant world events included the successful detonation of the Soviet atomic bomb in September and the establishment of the People's Republic of China in October. These developments heightened tensions in the Cold War, as they marked the beginning of the nuclear arms race and solidified the division between communist and capitalist blocs. The geopolitical landscape shifted dramatically, leading to increased military alliances and strategies in the West, particularly the formation of NATO in 1949. These events set the stage for further global conflicts and ideological confrontations in the following decades.