Which best expresses the conflicting political relationship between China’s Nationalists and Communists?

Responses

They fought each other over philosophical differences but also teamed up to fight outside invaders, after which their differences caused friction that pushed them apart once again.
They fought each other over philosophical differences but also teamed up to fight outside invaders, after which their differences caused friction that pushed them apart once again.

The enemies began as allies with the shared goal of uniting most of mainland China, but the Communists split off when the Nationalists planned a constitutional democracy.
The enemies began as allies with the shared goal of uniting most of mainland China, but the Communists split off when the Nationalists planned a constitutional democracy.

The two groups had coexisted peacefully until the 1960s, when the Soviets began trying to affect the course of Chinese politics by positioning its factions against one another.
The two groups had coexisted peacefully until the 1960s, when the Soviets began trying to affect the course of Chinese politics by positioning its factions against one another.

The two opposing factions had been engaged in warfare for so long that their constant battling achieved the status of a political tradition, one that had become part of their culture.

The enemies began as allies with the shared goal of uniting most of mainland China, but the Communists split off when the Nationalists planned a constitutional democracy.