Final answer:
The main message of George Washington's farewell address is to warn the nation about foreign alliances and political parties.
Step-by-step explanation:
The main message of George Washington's farewell address is to warn the nation about foreign alliances and political parties. In his address, Washington emphasizes the need for the young nation to steer clear of permanent alliances with foreign countries to prevent getting entangled in Europe's conflicts. He also warns against the dangers of political parties, cautioning that they can lead to division and undermine the unity of the country.