Chinese civilisation is one of the longest and continuous civilisations in the world, stretching back to antiquity. China is an old civilised and united multi-ethnic nation of 56 ethnic groups and unified with a common language (similar situation like the UK, US, Australia and Canada) but using English) called Mandarin. China has a big population and just to mention a few here, had many internal rebellions, conflicts, civil unrests and wars, natural disasters and famine, and invasions (from Japan, UK, France, Germany, etc) resulted in millions of deaths, displacement of people and sufferings.