The reasons for the alliance of multiple states during the Warring States Period are multifaceted. Firstly, the Warring States Period was a very special era in Chinese history, with vassal states ruling over different territories and constant disputes and chaos among them. During this period, the power contrast between states was evident, with a significant gap between strong and weak states. This led to intense concerns among states about their own security and interests. Therefore, states needed to unite and jointly resist powerful enemy states to ensure their own safety and interests.

Secondly, the Warring States Period was a crucial era in Chinese history, marking the beginning of feudal society. During this period, significant changes occurred in various aspects of society, including economy, politics, and culture. The emergence of various new systems and ideas also necessitated cooperation among states to jointly address the challenges brought by these changes.

Thirdly, the Warring States Period was a complex era in Chinese history, characterized by the interaction of various forces. In this period, not only was the power contrast between states evident, but also the power contrast within states was apparent. Therefore, states needed to unite and jointly coordinate internal conflicts to maintain national stability and unity.

Lastly, the Warring States Period was a turbulent era in Chinese history, with frequent wars and conflicts. During this period, wars and conflicts often occurred among states, necessitating their cooperation to jointly address external threats.

In conclusion, the reasons for the alliance of multiple states during the Warring States Period are diverse, including concerns about national security and interests, changes in social, economic, political, and cultural aspects, power contrast within states, and frequent wars and conflicts. These factors interacted, making it necessary for states to unite and jointly address various challenges to ensure their own safety and interests. This is one of the important reasons for the alliance of multiple states during the Warring States Period.

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