Why would Washington begin his speech discussing “unity of government”?

“The unity of government which constitutes you one people is also now dear to you. It is justly so; for it (unity in government) is the main pillar in the structure of your independence, the support of your tranquility at home; your peace abroad; of your safety; of your prosperity; of that very Liberty which you so highly prize.”
– George Washington

, 1796 Farewell Address

Washington began his speech discussing unity of government because he wanted to emphasize the importance of a unified government in order to maintain the independence, tranquility, peace, safety, prosperity, and liberty of the United States. He wanted to remind the people of the importance of a unified government in order to ensure the success of the nation.