Just looking from 1850 to Mao, there was: The Taiping Rebellion (30m dead), 2nd Sino-Japanese War (20m dead), Dungan rebellion (15m dead), Miao rebellion (5m dead), Red Turban rebellion (1m dead), Panthay rebellion (1m dead), Punti–Hakka wars (1m dead), Nationalist purges (1.5m dead), various Warlord Era conflicts (500k dead), 1911 revolution (200k dead), Boxer Rebellion (100k dead), and 1st Sino-Japanese war (50k dead). Not to mention residual deaths from the two World Wars not directly attributable to the conflicts above, but which would still number more than the losses the USA suffered in both wars.
The American Civil War was about ~750k dead. There is absolutely no comparison between the traumatic social conditions of 1940s China with even 21st century China let alone the United States. They were definitely not "role playing".