From [1]:

Many Americans are poorly informed about basic constitutional provisions, according to a new national survey by the Annenberg Public Policy Center.

The annual Annenberg Constitution Day Civics Survey finds that:

• More than half of Americans (53 percent) incorrectly think it is accurate to say that immigrants who are here illegally do not have any rights under the U.S. Constitution;
• More than a third of those surveyed (37 percent) can’t name any of the rights guaranteed under the First Amendment;
• Only a quarter of Americans (26 percent) can name all three branches of government.

"Protecting the rights guaranteed by the Constitution presupposes that we know what they are. The fact that many don’t is worrisome," said Kathleen Hall Jamieson, director of the Annenberg Public Policy Center (APPC) of the University of Pennsylvania. "These results emphasize the need for high-quality civics education in the schools and for press reporting that underscores the existence of constitutional protections."

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[1] annenbergpublicpolicycenter · org/americans-are-poorly-informed-about-basic-constitutional-provisions/