The Confederation period was the era of United States history in the 1780s after the American Revolution and prior to the ratification of the United States Constitution. In 1781, the United States ratified the Articles of Confederation and Perpetual Union and prevailed in the Battle of Yorktown, the last major land battle between British and American Continental forces in the American Revolutionary War. American independence was confirmed with the 1783 signing of the Treaty of Paris. The fledgling United States faced several challenges, many of which stemmed from the lack of a strong national government and unified political culture. The period ended in 1789 following the ratification of the United States Constitution, which established a new, more powerful, national government.