The document discusses the growth of presidential power in the United States over time. It explains that presidents have accumulated more authority due to factors like the need for decisive emergency action and the increasing complexity of the economy and technology. Congress has also strengthened the presidency on various occasions. The core executive powers of the president outlined in the document include enforcing the law, appointing officials, conducting diplomacy and commanding the military, as well as certain legislative functions like proposing laws and vetoing bills. Critics argue some presidents have become too isolated and unaccountable in their use of executive authority.