Jews
No. Mormonism is a Restorationist Christian religious movement. Followers of Mormonism come from many different ethnic groups around the world. It is true that some religious groups can double as ethnic groups (such as Judaism - although you can be an ethnic Jew but not a religious Jew, or religiously Jewish but not ethnically Jewish) but Mormonism has not had the thousands of years of intermarrying required to become an ethnic group.
They aren't fighting. In fact, the Phoenicians are extinct, and have been for thousands of years.
I presume that your question means "What ethnic group was the first present in the United States?" Well, the various Amerindians/Native Americans were present in the United States thousands of years before European colonization, so it would be the Amerindians.
A group of people, probably thousands and thousands of years ago.
The Hutu and the Tutsi have had differences for many years.
China vs Japan vs Korea. All known North American Indian tribes against their neighboring tribes. All known Central African tribes against their neighbors.
Palestine has been in wars for thousands of years.
Culture was not "invented" by a single person, but developed over thousands of years by people of different environments, religious beliefs, ethnic backgrounds.
The Zulus are an ethnic group predominantly based in South Africa and have existed for centuries. However, the Zulu kingdom, known for its military prowess, was established in the early 19th century by Shaka Zulu.
ionn man
thousands of years. They are both plural nouns
The largest ethnic group in Azerbaijan is Azeri Turks, who have been living in these territories over more that 5000 years. There have been more Azeri Turks who have come later in the 3rd and 11th centuries from East Asia, too. But they are also ethnically same as Azeri Turks who had been living in these territories over more that 3000 years