Final answer:
The American Indians in Oklahoma, particularly the Osage Nation, initially benefited from the oil found on their lands but faced grave exploitation including murder and swindling of land, which prevented them from fully capitalizing on the oil boom.
Step-by-step explanation:
American Indians living in Oklahoma faced numerous obstacles during the oil boom because of systemic issues and exploitation. Despite the discovery of oil on their lands, which initially brought some members of the Osage Nation considerable wealth, many were victimized through murder and marriage into the tribe by White neighbors who sought to claim their land and wealth. This sinister aspect of the oil boom is known as the Osage murders. Furthermore, the Curtis Act of 1898 and unethical practices by government officials and land speculators meant that many Native Americans were swindled out of their lands, including the highly valuable oil rights. The Osage Nation was an exception initially, due to their substantial oil wealth, but this wealth attracted criminal activities that led to a loss of life and property for the Osage people.