The most important obstacle to the adoption of the Constitution by the states was

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Many of the states were hesitant to support the Constitution because it did not include a bill of rights. The idea of a bill of rights was proposed by Anti-Federalists who were concerned about the potential for the federal government to become too powerful and infringe upon individual liberties. It wasn't until the first ten amendments, known as the Bill of Rights, were added to the Constitution that many of the states agreed to ratify it.

The Most Important Obstacle to the Adoption of the Constitution