George Washington's main argument regarding the future of the United States is that the United States should form alliances with powerful nations.
Option D is correct.
George Washington functioned as the very first President of the United States from 1789 until 1797. He was an American military leader, statesman, and Forefather.
His main focus on the future of the Unites States, about the development of the United States, by making the alliances with powerful nations to the United States.
Therefore, option D is correct.
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