Final answer:
Presidential roles such as term limits, the President's Cabinet, and the State of the Union address have emerged through tradition. The expansion of presidential power, including the use of executive agreements and the development of executive privilege and executive orders, have also evolved beyond the Constitution's explicit text.
Step-by-step explanation:
Roles of the U.S. President Not Specified by the Constitution
Several presidential roles have emerged through tradition rather than explicit constitutional mandate. One such example is the tradition involving presidential term limits, which started with George Washington's decision not to seek a third term and ended when Franklin D. Roosevelt served four terms; this was later enshrined in the Constitution via the 22nd Amendment. The President's Cabinet, although not specified in the Constitution, has become a central part of the executive branch, providing the president with valuable advice and support on various issues. The tradition of delivering a State of the Union address to both houses of Congress is another role that has been created by tradition rather than by constitutional requirement.
Over time, the role and power of the U.S. presidency have expanded in response to various domestic and international challenges. Notably, presidents have increasingly exercised their authority in foreign policy by making executive agreements without needing Senate approval, as is constitutionally required for formal treaties. Furthermore, the concept of executive privilege and the use of executive orders are examples of presidential powers that have been developed over time, outside of the explicit text of the Constitution.
Thus, the presidency continues to evolve as each president interprets and delineates the scope of their authority within the practical and political landscapes in which they govern.