he Long March had a profound impact on the CCP’s military and political strategies in the subsequent years. The grueling retreat taught the CCP the value of guerrilla warfare, a tactic they would later employ effectively against both the KMT and Japanese forces. The march also emphasised the importance of mobilising and gaining support from the rural peasantry, which became a cornerstone of CCP strategy. The hardships endured forged a sense of unity and purpose within the party, reinforcing the leadership of Mao Zedong. These experiences shaped the CCP’s approach to warfare, political mobilisation, and leadership, playing a crucial role in its future successes.

The Northern Expedition, launched by the KMT in 1926, significantly weakened the power of regional warlords in China. Prior to the expedition, China was fragmented, with various warlords controlling different regions. The KMT’s military campaign aimed to unify the country under its leadership, thereby consolidating national power. As the KMT forces advanced, many warlords were defeated or coerced into submission, drastically reducing their influence and control. However, this campaign also led to new power vacuums and shifting allegiances, which contributed to the continued instability in China. The weakening of warlords was a key step towards national unification, but it also paved the way for future conflicts between the KMT and CCP.

Foreign powers played a significant role in shaping the dynamics between the KMT and CCP. The Soviet Union provided ideological guidance and material support to the CCP, seeing it as a potential ally in spreading communism in Asia. Conversely, the KMT received support from Western powers, particularly the United States, which viewed Chiang Kai-shek's regime as a bulwark against the spread of communism in the Far East. This external support exacerbated the ideological and military divide between the KMT and CCP. The involvement of foreign powers added an international dimension to the conflict, influencing the strategies and fortunes of both parties.

The Xi'an Incident in 1936 was significant in redirecting the KMT’s focus from the internal Communist threat to the external threat posed by Japanese aggression. The kidnapping of Chiang Kai-shek by his generals forced him to realise the urgency of the Japanese invasion, which threatened the very sovereignty of China. This event led to the formation of the Second United Front, a temporary alliance between the KMT and CCP against Japan. This shift in focus was crucial, as it temporarily united the two most powerful political entities in China against a common enemy, highlighting the existential threat Japan posed to China’s independence and territorial integrity.

The ideological rift between the KMT and CCP was a fundamental factor in their deteriorating relationship. The KMT, led by Chiang Kai-shek, advocated for a nationalist, centralised government with elements of Western-style modernisation, while maintaining traditional Confucian values. In contrast, the CCP, led by Mao Zedong, aimed to establish a socialist state grounded in Marxist-Leninist principles, advocating for radical land reform and proletarian leadership. These conflicting visions for China's future were irreconcilable, leading to mutual distrust and competition for power. This ideological clash set the stage for the eventual breakdown of their alliance and the onset of civil war.