They Lost Mandate of Heaven.
George Washington's foreign policy was primarily to keep the United States neutral in foreign affairs as much as possible, as he did not believe it wise for the new nation to involve itself in the affairs of other nations. In this regard, he was not only successful, but set a precedent for U.S. foreign policy for many years to come.
Even though the Northern states were against the slave trade, it helped to finance the Industrial Revolution that happened in the major Northern States such as Boston and New York. Many US businesses got their start with profits from slave-produced goods and the slave trade.
It gave them enough time to gather troops and supplies.