Final answer:
The phrase 'We the People' begins the Preamble to the United States Constitution, embodying the principle of popular sovereignty and outlining the government's purposes.
Step-by-step explanation:
We the People are the opening words of the Preamble to the United States Constitution. This phrase indicates the fundamental principle of popular sovereignty, which means that all governmental power derives from the citizens of the nation. The Preamble goes on to articulate the objectives of the government, which include forming a more perfect Union, establishing Justice, ensuring domestic Tranquility, providing for the common defense, promoting the general Welfare, and securing the Blessings of Liberty for present and future Americans. This powerful opening contrasts with the former governance under the Articles of Confederation and signifies the establishment of a government based on the will of the people. The Constitution established a structure for the nation's government, introducing checks and balances among the legislative, executive, and judicial branches.