Final answer:
The invasion of this region that temporarily halted the fighting between the KMT and CPC refers to the invasion of Taiwan by the Chinese Communist Party (CCP) forces in 1950.
Step-by-step explanation:
The invasion of this region that temporarily halted the fighting between the KMT and CPC refers to the invasion of Taiwan by the Chinese Communist Party (CCP) forces. After the defeat of the Nationalist forces led by Chiang Kai-shek by the CCP in 1949, Chiang fled to Taiwan. The invasion of Taiwan by Mao's forces in 1950 temporarily halted the fighting between the two factions.