Shifts in Congressional vs Presidential Powers refer to the changing dynamics of authority between the legislative and executive branches of the U.S. government. This term highlights how, at various points in history, the balance of power has leaned more towards Congress or the President, often influenced by significant events such as wars, crises, or landmark legislation. Understanding these shifts is crucial for grasping how governance and policy-making have evolved over time, particularly during periods like the Mexican-American War.