The Constitutional Convention took place in Philadelphia between May and September of 1787, aiming to address the problems of the Articles of Confederation, the first American constitution, which granted independence and sovereignty to the states at the expenses of a weak central government, that lacked the ability to levy taxes, regulate commerce, participate in foreign affairs, among others.
Americans found necessary a stronger Federal government with more specific powers and the Congress called the Constitutional Convention.
A lot of boomtowns eventually turned into abandoned ghost towns. When the gold ran out in an area, the miners would leave to find the next gold strike. The businesses would leave too and soon the town would be empty and abandoned.