Dude, look like you are the one that needs to check your facts.
Internal conflicts? By your logic, China was under Japan, Britain, Manchu, Mongolia, etc rule for years so those countries can invade and retake China as their own land? Right? US was under Britain rule once, so it is ok for Britain to invade and take it back, right? How about Iran (Persian Empire)? How about Italy (Rome Empire)? Let them invade and reclaim their former land, right?
China invaded and enslaved Vietnam for almost 1,000 years and you called that as brieft conflict? Do they teach you anything about history? How about you google "history of Vietnam" before you insert foot into your own mouth and make a fool out of yourself.
About Korea, google "history of Korea" and see for yourself how China tried to invade Korea looooooong before the Korea war in 50's.
China attacked Vietnam in 1974 at Paracel Islands and 1988 at Spratley Islands and murdered Vietnamese sailors. China attacked Phillipines and took Johnson Reef from Phillipines without any causes or provocations. China military ships captured, beat up and stole fishes from poor and unarmed fishermen and then demanded ransome money. China ships harrash other nations ships and cut their survey cables well within their own EEZ. China declared the whole sea as its own based on some faked/made up maps. Do you want me to go on?
Did you see in my previous post say anything about the US was a perfect model? None. Your post was about China did not attack anyone. I said otherwise and have links/sources to back me up. Can you read?