What might the Founding Fathers have included in the Constitution to ensure that the United States would become “a more perfect Union”?

One of the main things that motivated the Founding Fathers to include the phrase “to form a more perfect union” in the Preamble of the U.S. Constitution is because they knew that things like slavery and other impaired citizens' rights would have to be eliminated someday. What does it mean a more perfect union?

Explanation: That's all

a historian who compares the expansion of political systems to the expansion of economic systems to the expansion of economic systems is organizing history by theme.

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the answer is states.