Answer:
The federal government of the United States exercises sovereignty over the entire territory of the nation, in all matters that the states have delegated to it in the Constitution.
Thus, the federal government is in charge of tasks such as the administration of justice, the organization of the armed forces or the power to declare war.
But on many issues, the states have reserved for themselves the power to regulate themselves within the scope of their respective territories. Thus, each state has its own constitution, they are financed through their own taxes, and they enact their own laws independently of those of the federal government. Thus, for example, California has a certain degree of legalization regarding marijuana, while at the federal level its use is considered a crime.
Therefore, the federal government's control over the states is light, and only applies to issues of vital importance to the development of the nation, such as national security issues.
