We are taught that the Constitution was necessary to avoid imminent destruction from any number of horrors, including invasion by a foreign power, civil war, or economic upheaval as a result of protectionism by the states.
Led by Alexander Hamilton, the Federalists sought a much more powerful central government with a central bank, a standing army, and an alliance with big business that would control the economy. In opposition to them were Thomas Jefferson, Patrick Henry, and their followers that believed that the central government's powers should be limited, and that power should be concentrated locally (and mistrusted generally). They opposed a central bank and a standing army and supported a truly free market.
Like the Patriot Act, the TARP bill, and the Climate Treaty, The U.S Constitution was conceived and drafted in an atmosphere of panic that was created by proponents of big government for the express purpose of using fear to win support for a massive expansion of government power. Also like TARP or the Patriot Act, it was debated in secret by a convention of delegates that were told that unspeakable horrors awaited America if they did not pass it immediately.
The U.S. Constitution does not embody the American spirit. It is a document that grants power to government. The document that truly embodies the American spirit is the Declaration of Independence, which was written expressly to remove all power from the existing government.