Which of the following events is NOT considered one of the major developments in 1949?

The construction of the Berlin Wall did not occur in 1949; it was built much later, in 1961. Thus, it cannot be considered a major development of that particular year.

In contrast, 1949 was a significant year in the context of the Cold War and the geopolitical landscape. The Soviets successfully tested their first atomic bomb that year, which marked a critical shift in global power dynamics and the arms race. Similarly, the formation of NATO (North Atlantic Treaty Organization) in April 1949 represented a collective defense agreement among Western nations, directly opposing the Soviet threat. Additionally, the establishment of the People's Republic of China under Communist rule was also a crucial development in 1949, significantly impacting international relations and the spread of communism. Each of these events represents key moments that defined the political climate of the time, while the Berlin Wall's construction is tied to events occurring more than a decade later.