The U.S. Constitution protects freedom of speech from government censorship through which amendment?

The First Amendment of the U.S. Constitution is the cornerstone of American freedom of speech, explicitly prohibiting Congress from making laws that infringe upon the freedom of speech, press, assembly, or the right to petition the government. This amendment was established to ensure that individuals have the right to express their ideas and opinions without fear of retaliation or censorship by the government.

In contrast, the other amendments mentioned do not serve this specific purpose. The Second Amendment pertains to the right to bear arms, the Fifth Amendment deals with rights in criminal proceedings and protection against self-incrimination, and the Ninth Amendment discusses the rights retained by the people that are not specifically enumerated in the Constitution. Thus, the First Amendment uniquely emphasizes the protection of free speech.