The paragraph contains three citations that support its claims about the early agricultural practices of hunter-gatherer groups near the Mississippi River. The first citation, "(O'Brien and Kiffel-Alcheh, 2021)," corresponds to the introduction of agriculture around 800 B.C.E., indicating the transition from nomadic lifestyles to more settled ones. The second citation, "(Mississippi State University)," complements the statement about the favorable climatic conditions of the Mississippi River valley, emphasizing its reliability for sustaining settlements without the threat of extreme weather. Lastly, the third citation, "(History editors, 2020)," references the mention of specific tribes—Cherokee, Chickasaw, Choctaw, and Creek—who thrived in the region due to the cultivation of staple crops such as maize, beans, and squash, linking the agricultural success directly to the prosperity of these communities.

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The paragraph cites three sources regarding early agricultural practices of hunter-gatherer groups near the Mississippi River. The first citation, "(O'Brien and Kiffel-Alcheh, 2021)," highlights the transition to agriculture around 800 B.C.E., marking a shift from nomadic to settled lifestyles. The second citation, "(Mississippi State University)," notes the favorable climatic conditions of the Mississippi River valley, which supported stable settlements. Lastly, the third citation, "(History editors, 2020)," mentions tribes such as the Cherokee, Chickasaw, Choctaw, and Creek, linking their prosperity to the cultivation of staple crops like maize, beans, and squash.