What caused the American Civil War to break out? Was there one factor that caused more conflict leading to the American Civil War?

There were multiple factors that led to it.

The “stepping stones” that caused tensions to rise:
1: People in the North wanting to ban slavery.
2: People in the South wanting to keep slavery around.

The reasons that directly led to the war:
1: Abraham Lincoln being elected as the president of the US.
2: The South seceding from the North and making their own country.

The president of the united states does not have the authority to “limit” the power of the judicial branch. however, the president can influence the political direction of decisions made by justices on the supreme court through the nomination process when a position becomes available.i would say the best answer is that he can at least interpret the laws