Final answer:
The Y people form alliances between villages for protection, resources, and stability. These alliances enable mutual defense, increase access to resources, and establish a power structure.
Step-by-step explanation:
The reason for the Y people forming alliances between villages is primarily due to the need for protection and resources. In ancient civilizations, villages often faced the threat of attacks from rival groups, which led to the formation of alliances for mutual defense. By banding together, villages could pool their resources and manpower to better withstand these attacks.
Additionally, forming alliances allowed villages to have access to a wider range of resources. Trade and cooperation between villages could lead to economic benefits such as increased trade opportunities, sharing of agricultural products, and access to specialized skills or goods.
Furthermore, alliances between villages could also lead to the establishment of a power structure that provided stability and governed the communities. These alliances often involved the creation of leaders or chiefs who could make decisions on behalf of the alliance.