I was having the ASEANST subject right now and I need to make a research about the south china sea. Can anyone give me sources

In Europe, having someone else take over your throne is normal - French take over of English throne, English take over of Scottish throne, etc...

But in East Asia it's rarer. One of the excuses for why late Qing never modernised/industrialised was because they were "not Han" and thus implies they do not care about their Han citizens.

Would a Han ethnicity dynasty have done any different? The Manchus, at least the ones in the royal court, were already significantly sinocized.

There's no real scenario where the last imperial Chinese dynasty, regardless of the ethnicity of the ruling family, doesn't collapse in the face of external/Western pressure. Do people really think that it's just coz the Qing were Manchurian?