How does the first sentence of the preamble express the principle representative democracy

The U.S. Constitution Preamble sets out the goals of the government and provides an introduction to the Constitution and the State. It expresses the principle of representative democracy, meaning that the people hold the power exercised through elected representatives, and lays out the promotion of general welfare, justice, tranquility, defense and liberty to all citizens. The statement "We the people..." effectively conveys this central idea.