Which of the following rights is guaranteed to everyone living in the United States?

The right to freedom of expression and speech is a fundamental right guaranteed to everyone living in the United States, as enshrined in the First Amendment to the Constitution. This amendment affirms the freedoms of speech, press, assembly, and the right to petition the government. As such, it protects individuals' rights to express their thoughts and opinions without government interference or censorship, creating an essential foundation for democratic discourse and the functioning of a free society.

The other options do not constitute rights guaranteed to all individuals in the same manner. The right to bear arms is protected under the Second Amendment, but it is subject to regulation and interpretation. The right to privacy is recognized but is not explicitly stated in the Constitution; it has been developed through various Supreme Court decisions. Access to free healthcare, while a significant issue, is not recognized as a guaranteed right under the Constitution. Thus, freedom of expression and speech stands out as a clearly defined and protected right for all individuals in the United States.