The fact is from 1931, when Japan invaded China, to 1941, when US entered the war (WWII), China just rolled over and/or was losing battles to Japan. It took US just 4 years to defeat the Japanese and save China from becoming a colony of Japan.
Whatever stand that suits China?
Outrage as China lays claim to Genghis Khan
By Graeme Baker
12:01AM GMT 30 Dec 2006
He swept all before him and subjugated much of the known world. But now, almost 800 years after his death,
Genghis Kahn is embroiled in another war as China attempts to adopt the Mongol king as its own national hero.
In stark contrast to Mao Zedong, who insisted Genghis was only fit to fire arrows at birds, communist officials and historians now say he represents the essence of new China – a unifying force for a strident land of many ethnic minorities.
"We define him as a great man of the Chinese people, a hero of the Mongolian nationality, and a giant in world history," said Guo Wurong, the manager of the new Genghis Khan "mausoleum" in China's Inner Mongolia province.
"Genghis Khan was certainly Chinese," he added.
The ''mausoleum" was built on a spot the Mongol leader was said to have passed on his way to his final war in 1227, and holds artefacts including his bow and saddle.
But the buildings resemble many Chinese imperial tombs, drawing criticism for historical inaccuracy.
And recent Mongolian festivals of riding, shooting and wrestling, once banned but now subsidised by the Chinese state, have been "communised", according to one Mongolian official who did not wish to be named.
Such rewriting of history has raised the hackles of Mongolians, both in the independent (outer) Mongolian state and inside China.
They see the attempt to claim their national icon as part of a Chinese plan to expand influence.
Promoting Genghis Khan as Chinese also helps promote the party line that Inner Mongolia is an important part of China, despite the fact that many ethnic Mongols still yearn for independence.
Many remember the Cultural Revolution, when, according to reports, between 10,000 and 17,000 died in the terror, 87,000 were crippled and 346,000 persecuted.
Professor Baildugqi, an expert on Mongolian history at the Inner Mongolia University, said new Chinese commemorations of Genghis Khan went against all that he was.
"You cannot use the methods of the [Chinese] interior to commemorate Genghis and his culture," he said.
The official justification rests on the view that Genghis Khan was Chinese because his successors ruled as Chinese emperors and there are many Mongolians now living in China.
But it is a view dismissed by many Mongols.
On a popular website on such issues, one contributor wrote: "Now there are quite a few Mongolians in China, and they have Chinese citizenship. But that does not make Mongolians [of the times of Genghis] Chinese. If your grandson moves to the US and becomes a US citizen, that will not mean that you and your dad were Americans."
Calling Genghis Khan a Chinese hero has also upset some inside China. Many Chinese retain the view of Mao that he was no more than a barbarian warlord.
https://www.telegraph.co.uk/news/worldnews/1538174/Outrage-as-China-lays-claim-to-Genghis-Khan.html