How is "free speech" guaranteed to USA residents?

Question

How is "free speech" guaranteed to USA residents?

Answer 1

The  First Amendment to the Constitution

"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."

be aware that some speech is not protected such as fighting words, libel, obscenity and some other emerging categories.

Answer 2

Theoretically, this First Amendment right is guaranteed by the tools for social work that we're promised permission to possess through the Second Amendment.

Answer 3

It is because free speech is in the Bill of Rights.