Based on the reaction of the Sioux people because of their good crop, who do they think is responsible for their good fortune? How do you know that according to the text?

According to the text, the Sioux people believe that Iktomi, the spider-trickster, is responsible for their good fortune because it was he who had helped and guided them in choosing the proper seed and location to grow their crops. This is evident from the following statement in the text: "It was Iktomi the cunning who watched and guided the Dakota people in making this great agricultural discovery, and from this tribe many other tribes have since learned the art of raising corn."