What is the corroboration to the following

Excerpl from Transcript of 14th Amendment to the U.S. Constitution: Civil Rights (1868)
AMENDMENT XIV
Section 1.
All persons bom or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, berty, or property, without due process of law, nor deny to any person within its jurisdiction the equal protection of the laws.
Transcript of 15th Amendment to the U.S. Constitution: Voting Rights (1870)
Fortieth Congress of the United States of America; At the third Session, Begun and held at the city of Washington, on Monday, the seventh day of December, one thousand eight hundred and sixty-eight. A Resolution Proposing an amendment to the Constitution of the United States.
Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, (two-thirds of both Houses concurring) that the following article be proposed to the legislature of the several States as an amendment to the Constitution of the United States which, when ratified by three-fourths of said legislatures shall be valid as part of the Constitution, namely:
Article XV.
Section 1. The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude
Section 2. The Congress shall have the power to enforce this article by appropriate legislation.

The corroboration to the excerpts from the 14th and 15th Amendments is found in the Constitution of the United States itself. The 14th Amendment, ratified in 1868, explicitly states that all persons born or naturalized in the United States are citizens and are protected by both national and state laws. It prohibits states from making or enforcing any laws that would violate the privileges or immunities of US citizens, and it also guarantees that no person can be deprived of life, liberty, or property without due process of law.

The 15th Amendment, ratified in 1870, specifically addresses the right to vote. It declares that the right to vote cannot be denied or abridged based on race, color, or previous condition of servitude. This amendment empowers Congress to enforce and protect this right through appropriate legislation.

Both amendments aim to ensure equal protection and rights for all citizens of the United States, regardless of race or previous status. They represent significant milestones in the expansion of civil rights in the country.