What is a key power of the federal government often related to international agreements?

The key power of the federal government that is often related to international agreements is the ability to make treaties. This power is explicitly granted to the federal government in the U.S. Constitution, specifically in Article II, Section 2. The President has the authority to negotiate and sign treaties with other countries, but these treaties must be ratified by a two-thirds vote in the Senate to become legally binding. This process underscores the federal government's role in managing foreign relations and international diplomacy, reflecting its responsibility to represent the nation in dealings with other sovereign states.

The other options do not pertain to international agreements: conducting elections is a power typically managed at the state level, establishing public schools falls under state and local government authority, and regulating commerce primarily addresses domestic economic matters rather than international treaties. Thus, the correct answer highlights a fundamental aspect of the federal government's role in engaging with global affairs.