What is the significance of the year 1945 in relation to international relations?

The significance of the year 1945 in relation to international relations primarily stems from the establishment of the United Nations. Following the devastation of World War II, the international community recognized the necessity for a new organization that could promote peace, security, and cooperation among nations to prevent future conflicts. The United Nations was founded in October 1945, with the main objectives of addressing global issues, fostering diplomatic dialogue, and providing a platform for conflict resolution. This marked a pivotal shift in how nations interacted with one another, emphasizing collaboration and multilateralism over unilateral military actions.

In contrast to the other options, 1945 does not relate to the end of World War I or the signing of the Treaty of Versailles, which occurred in 1919. While the Cold War began shortly after this year, it is more accurately associated with the geopolitical tensions and divisions that developed in the late 1940s and into the 1950s. Therefore, the founding of the United Nations stands out as a significant turning point in international relations during this year.