Which of the following actions is NOT a power of the federal government?

The correct answer is "Managing state parks" because this task falls under the jurisdiction of state governments, not the federal government. Each state has the authority to manage and regulate their own parks, public lands, and natural resources, reflecting the principle of federalism where powers are divided between national and state governments.

In contrast, making treaties with foreign nations, establishing immigration laws, and creating federal laws are all powers that are explicitly granted to the federal government by the U.S. Constitution. These responsibilities are essential for managing national affairs, maintaining international relations, and ensuring a uniform legal framework across the states. Thus, while the federal government operates with significant authority in many areas, state parks management is specifically reserved for state jurisdiction, underscoring the balance of power established in the U.S. system of government.