The correct answer is D) Presidents' increasing willingness to veto any laws that raised taxes.
The development that most led to changes in the level of presidential power during the 20th century was the Presidents' increasing willingness to veto any laws that raised taxes.
Article II of the US Constitution states the powers of the United States President. Under the Constitution, the President can sign new legislation or can veto it. He can gran reprieves and pardons, he is the Supreme Commander of the Armed Forces, he is the Chief Diplomat of the country, receives ambassadors, and he can make foreign treaties. During the 20th century, the Presidents has increased willingness to veto any laws that raised taxes when he tries to protect the economy of the citizens and the welfare of the nation.
