The fundamental idea expressed in the declaration of independence that was demonstrated by rebellion and the constitutional convention is: popular sovereignty. If the government denies its people rights, it can be overthrown.
Popular sovereignty is the idea that the government exists to serve its people. So the representatives in the government are chosen (elected) by the people to make decisions on their behalf in Congress. Meanwhile, the citizens vote directly on laws through referendums at the state level. In short, the popular sovereignty concept has this fundamental idea: the US is an independent nation governed by Americans and controls its own affairs.
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