The Philadelphia Convention was convened in May 1787 to address problems in governing the United States under the Articles of Confederation. 55 delegates attended, though key figures like Thomas Jefferson and Patrick Henry did not. James Madison had called for revisions to improve the Articles of Confederation. The convention decided to create an entirely new constitution instead, keeping their discussions secret. They debated plans like the Virginia Plan, which proposed a strong national government, and the New Jersey Plan, which proposed keeping power with the states. Through compromise, they developed a new constitution with a balanced federal government consisting of three branches having checks on each other.