I think his failures were his disregard for the U.S. Constitution and our checks and balances political system, his obsession with regulating business, and his constant interference in the private sector.
The different independent agencies and commissions that exist within the executive branch are chosen through appointment by the president of the United States of America himself. They are chosen by appointment and confirmation to be exact, respectively. Another important would note that aside from this, the president also serves as the Commander-in-Chief of the United States of America.
Because one of the major powers who instigated the war did not take part in it
