Final answer:
The Akimel O'odham refer to the Pima people, known as 'river people,' who live in the Southwestern United States and have a rich history of agriculture.
Step-by-step explanation:
The Akimel O'odham are a group of indigenous people that are more commonly known by the name Pima. The term 'river people' appropriately describes the Pima who historically have lived along the Gila and Salt Rivers in what is now Arizona, creating complex irrigation systems to support their agriculture. This group is different from the Hopi, Navajo, and Mojave, who have distinct cultures and historical backgrounds. The Pima are recognized for their skills in farming, especially with crops such as corn and beans, and have a long history in the Southwestern United States.