I think China would prefer to resort to diplomatic measures, and in time, I see them reunifying.
The real big threat is what does China do to Japan. For the Chinese, the Japanese have not answered for their murderous endeavors in China during WWII. The Chinese want their pound of flesh, and we are on the wrong side of that conflict. They have not forgotten what the Japanese did.
When the USA collapses, and we will I believe at some point, the Chinese will extract their revenge.
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An emphatic demurral.
Europe was blessed, as its catalyst/creator, was Ancient Greece and Rome.
Asia was never so blessed until Great Britain colonized the Indian Raj and
Commodore Perry sailed into Tokyo Bay; both events occurring mid-19th century.
This opened the eyes of both India and Japan to the reality that there was a
real world beyond their borders. But China has remained insular to this very day.
Japan looked west and saw a kindred island nation that was the most powerful
in the world. How so??? Because the Royal Navy let Britain go wherever/whenever
she chose. That was the inspiration behind the power of Japan who dominated both
China and Russia continuously from that period to current times.
The argument is made that population translates into power and it's fatuous malarkey.
* In 1900, Russia had almost 3x the population of Germany; yet was thrashed by the
latter in the Great War.
* In ancient times Persia had some 5x the manpower of Greece, yet Alexander destroyed
the Persian Empire in a day!!!!!
* China has a population of 1.4 billion yet was defeated by Japan w/a population of
125 million, repeatedly, over the last 100 years.
The catalyst for Power has always been Ideas, hardly numbers.
By that standard China, an insular nation that cheats, lies and steals, is an extremely
long way from attaining world power.