红军长征到达陕北前后,日本帝国主义加紧了变中国为其殖民地的侵略行动,中日民族矛盾上升为主要矛盾,抗日救亡成为中国历史的主流。中国共产党识时务、顾大局,以民族利益为重,积极筹划和推进国共两党的第二次合作,建立起广泛的抗日民族统一战线。在这一时期,中国共产党是构筑抗御敌顽钢铁长城的中流砥柱。 Before and after the Long March of the Red Army arrived in northern Shaanxi, the Japanese imperialists stepped up their aggressive actions of turning China into their colony. The contradictions of China and Japan rose as the main contradiction and the anti-Japanese national salvation became the mainstream of Chinese history. Recognizing the times and taking care of the overall situation, the Chinese Communist Party takes the national interest as its priority, actively plans and promotes the second cooperation between the two parties and establishes a wide range of anti-Japanese national united front. During this period, the Chinese Communist Party built the mainstay of the Great Wall against the enemy.