Final answer:
Native American groups in the Southwest flourished due to arid conditions, the Great Drought, movement towards smaller settlements, and wet conditions.
Step-by-step explanation:
The Native American groups in the Southwest flourished between 900 and 1130 CE due to various factors.
- Arid conditions: The arid conditions of the region forced tribes to perfect architecture and expand trade routes.
- The Great Drought: The Great Drought forced groups to improve dwelling structures and expand trade routes.
- Movement towards smaller settlements: The movement towards smaller settlements allowed people to perfect pottery and domesticate animals.
- Wet conditions and nearby rivers: A period of wet conditions and nearby rivers allowed tribes to perfect irrigation farming.