The phrase "We the People" in the Preamble to the Constitution was clarified to mean all citizens by the

14th amendment

24th amendment

26th amendment

9th amendment

The 14th Amendment since the amendment limits the action of state and local officials. In addition to equal protection under the law to all citizens, the amendment also addresses what is called "due process", which prevents citizens from being illegally deprived of life, liberty, or property.