Imperialism in China during the late 19th and early 20th centuries?

qing dynasty（1644-1911）, one examples: Qing is Vietnam & Korean's suzerain! china contorl Mongolia population, if quantity of mongolians is more than he's permission, the excrescent mongolians will be killed by 1/8 or 1/6...... and the Han nationality， the Hui nationality and Mongolia nationality were insulated!