"The spirit of liberty that had been so invigorated by the events of the 1770s did manifest itself in a number of important measures affecting the status of America's slaves. In 1777 the constitution for the new state of Vermont completely abolished slavery, and Massachusetts soon followed suit. Many other Northern states, such as Pennsylvania in 1780, adopted legislation aimed at gradual emancipation during this period, although it was not until 1804 that New Jersey finally enacted a similar law. Not surprisingly, in the South anti-slavery gains were much more modest. But three Southern states, including Virginia in 1782, passed laws that made it possible for owners to manumit their slaves. It was the provisions of this law that Washington had to respect in formulating the manumission plan outlined in his will."