What is so important about the 14th Amendment? How did it fundamentally change the Constitution?

What is so important about the 14th Amendment? How did it fundamentally change the Constitution? 1- Essay: 1400 words at least.2- MLA style3- Outside sources one of them from the book, (We the People, 9th edition), you may use academic journals, scholarly books, and newspaper source. 4- Work Cited page5- Do not cite any encyclopedia sources (e.g., Wikipedia, Britannica Online Encyclopedia).6- In the paper, do not write the question. Make the essay title based on the content of the question and provide the title in the paper