What enumerated power of the president has the most potential for lasting impact?

The enumerated power of the president that has the most potential for lasting impact is the authority to issue executive orders. This power allows the president to direct the operations of the federal government and implement policy changes without needing congressional approval. As executive orders can shape significant areas such as Immigration, environmental regulation, and national security, their effects can persist long after a president leaves office, especially if subsequent administrations choose to uphold or build upon them.