What is the war powers resolution? was it effective?

The War Powers Act is a congressional resolution designed to limit the U.S. president’s ability to initiate or escalate military actions abroad. Among other restrictions, the law requires that presidents notify Congress after deploying the armed forces and limits how long units can remain engaged without congressional approval. Enacted in 1973 with the goal of avoiding another lengthy conflict such as the Vietnam War, its effectiveness has been repeatedly questioned throughout its history, and several presidents have been accused of failing to comply with its regulations.