Final answer:
The end of the Revolutionary War and the Treaty of Paris did not provide for Indigenous groups, leading to the cession of their lands to the United States without their consent or participation in the treaty negotiations, which ultimately enabled American expansion into Native lands. The correct answer is option OC
Step-by-step explanation:
The Indigenous groups in the new nation were significantly affected by the end of the Revolutionary War. The 1783 Treaty of Paris, which ended the Revolutionary War, did not include any provisions for Indigenous groups, a fact that is reflected in option OC. Their lands were effectively ignored and subsequently claimed by the United States. The ramifications of this omission were immediate and severe, as the treaty ceded Western lands and the frontier problems that accompanied them to the United States, without the consent of the Indigenous populations.
The new American policies, demonstrated by the Northwest Ordinance, professed to deal with Indigenous groups in good faith. However, they also sanctioned the expansion into Native lands which contradicted the expressed ideals. Historical documents reveal that the treaty ignored the fact that many tribes had taken sides in the war and that Native American interests, particularly their land rights, had been a considerable factor in the conflict.