Name one right only for United States citizens.

The right to vote in federal elections is indeed a right specifically granted to United States citizens. This right is articulated in several amendments to the U.S. Constitution, notably the 15th Amendment, which prohibits the denial of the right to vote based on race, and the 19th Amendment, which grants women the right to vote. Citizens have the responsibility and privilege to participate in the democratic process through voting for their representatives in Congress and for President, thereby playing a crucial role in shaping government policies and leadership.

In contrast, the other rights mentioned, such as free speech, trial by jury, and assembly, while important and fundamental, are rights that are extended to all individuals within the U.S. regardless of their citizenship status. These rights are protected under the First Amendment and other legal provisions, meaning that even non-citizens have the ability to exercise these rights in the United States. This distinction highlights why the right to vote in federal elections is uniquely tied to citizenship, marking it as the correct answer to the question.