China has remained united and intact continuosly for the past 5000 years
China did not break up during the time of the;
"WARRING STATES"----2500BC, when 5 warring states fought each other continuosly
"THE OPIUM WAR"----1860-1900 when all the major Western Powers attacked her simultaneously
"THE 2nd WW" , 1937-1945, when Japan bombed her back to the Stone-Age. The Chinese fought on against overwheming odds,suffering great hardships, and losing 38 million dead,
"THE CIVIL-WAR" 1945-1949 The Cummunists against the Nationalist Armies
The GREAT CULTURAL REVOLUTION, When the country was in total chaos. The Maoist against the Moderates
Will China break up now ?????
A good question......
For the first time in 5000 years, the common man in China is experiencing some resemblance of liberty, even though it's economic liberty and not civil liberty.
The regime will either change and China will stay united, or the regime will not change and it will slowly break apart.
Of course, there are those who argue that a nationalist China, beholden only to the setiment of repressed ethnic Han pride, would be more of a danger than the communist one...