Final answer:
The United Nations encouraged member countries to continue following existing treaties after its formation in 1945 and provided a platform to peacefully resolve any disputes.
Step-by-step explanation:
How the United Nations handled pacts and treaties made before its creation in 1945 is an important aspect of post-World War II history. The UN did not replace existing treaties nor did it renegotiate them as a matter of course. Instead, it encouraged its member states to abide by international agreements and sought to provide a platform for peaceful resolution of disputes going forward. The United Nations was established with various foundational goals, such as maintaining international peace and security, developing friendly relations among nations, and promoting social progress and human rights. Although certain World War II agreements, like the United Nations charter itself, did supersede prior arrangements, in general, the UN did not systematically replace or renegotiate existing treaties among its members.
Treaties that predated the establishment of the UN continued to be valid unless they were specifically revised or replaced by new agreements under the UN's auspices. The UN's approach was more about creating frameworks for future peace and cooperation rather than discarding the diplomatic work that had come before it.