The action by the state of Maryland which led to McCulloch v. Maryland was that it attempted to stop a branch of the Second Bank of the United States from bringing in notes that were not made in Maryland, as they were taxed if they were from out of state.
This case led to the necessary and proper clause being used and is one of the most famous Supreme Court cases in the history of the United States.
At base, there is an ethical justification for the dropping of the bomb on Hiroshima as the United States was ready to mount a full scale invasion of Japan from China.
However, the Japanese were not given adequate time to surrender and so the dropping of the bomb on Nagasaki was inexcusable.
The resulting outcry across the United States led to a number of antiwar demonstrations—it was at one of these demonstrations that the National Guard shot four protesters at Kent State.