Answer:
Their sculptures and artifacts.
Explanation:
The Olmecs were extremely talented artists and sculptors: they produced many statues, masks, figurines (Yes, figurines were a thing back then), stelae (I know you're confused. A stela (the singular form of stelae) is an upright stone or column typically bearing a commemorative inscription or relief design, often serving as a gravestone.), thrones and more. However, they are best known for their colossal heads, 17 of which have been found at four different archaeological sites.
The first picture is an Olmec head, and the second is a stela.
By creating monopolies and establishing trusts
He needed Britain's aid to avert land being ceded to French settlers in the Louisiana Purchase. He needed Britain's aid to battle against Governor Harrison's soldiers at Prophetstown. He needed Britain's aid to restrict American settlements from encroaching on Indian land. He needed Britain's aid to subdue his brother Lalawethica, who had staged a coup.
Great people like everyone else
I think this act lessened traditional influences of Indian society by making land ownership private rather than shared. This act promised, but failed to deliver U.S citizenship to Native Americans. The act took about two thirds of Indian land.