The first amendment applies to young Americans because the first amendment provides basic rights that all Americans have and need to carry out their daily life. The fourth amendment is the amendment permitting peoples property from being searched without a warrant meaning young Americans can also have their privacy as older Americans do. Then the sixth amendment allowing that person to have a speed and public trial permitting the young American to be able to have fair court case if he or she ever commits a crime.
Granted citizenship to all persons born or naturalized in the United States -including former slaves - and guaranteed all citizens "equal protection of the laws".