Group of people who were established in America before the pilgrims arrived on the Mayflower:

There were several Native American tribes and groups who were established in America before the arrival of the Pilgrims on the Mayflower. Some of these include:

1. Native Americans of the Northeast: Tribes such as the Wampanoag, Narragansett, Mohican, Pequot, and Powhatan were among the many indigenous groups living in present-day New England and the Mid-Atlantic region.

2. Native Americans of the Southeast: Tribes like the Cherokee, Creek, Choctaw, Chickasaw, and Seminole inhabited areas ranging from present-day Florida to parts of modern-day Oklahoma.

3. Native Americans of the Great Plains: Tribes such as the Lakota Sioux, Cheyenne, Blackfoot, Pawnee, and Crow were among the indigenous groups who roamed the vast plains region of America.

4. Native Americans of the Southwest: Tribes like the Apache, Navajo, Hopi, Zuni, and Pueblo Indians lived in the arid desert regions of present-day Arizona, New Mexico, and parts of Utah, Nevada, and Colorado.

5. Native Americans of the Pacific Northwest: Tribes such as the Chinook, Tlingit, Haida, Kwakiutl, and Makah inhabited the coastal areas of present-day Washington, Oregon, and British Columbia.

6. Native Americans of the Great Basin: Tribes like the Shoshone, Paiute, Ute, and Washoe resided in the arid Great Basin region, which covers portions of present-day Nevada, Utah, Idaho, and Oregon.

These are just a few examples of the Native American tribes and groups who were established in America before the arrival of the Pilgrims.