Final answer:
The Great American Triad consists of the crops corn, beans, and squash, also known as the Three Sisters, which thrive together through intercropping.
Step-by-step explanation:
The Great American Triad consisted of three key crops: corn, beans, and squash. These plants are commonly referred to as the Three Sisters and were an agricultural staple among the Indigenous peoples of North America. This combination of crops is known for the way they benefit each other when planted together, a method called intercropping. For example, corn provides a structure for the beans to climb, beans add nitrogen to the soil which benefits all three, and squash spreads along the ground blocking sunlight to weeds, thus helping prevent them from growing.
Answering related questions, the crop from the provided options that did not originate in the New World is wheat. This is helpful in identifying crops that were important in the Americas versus those brought in from other parts of the world.