Who was involved in the issue addressed by the proposal of the 10th amendment?

The issue addressed by the proposal of the 10th Amendment primarily involved the federal government and the states. The amendment was proposed in response to concerns that the federal government was overstepping its constitutional powers, thereby infringing on states' rights. It aimed to clarify that powers not delegated to the federal government by the Constitution, nor prohibited to the states, are reserved for the states and the people, thus affirming the principle of federalism.