The Earth may be divided among many countries, but since there is only one Heaven, there can be but one tianxia, or “all-under-heaven”. The Chinese concept tianxia might be literally translated into English as “sky-beneath”, and it has been variously rendered as “enlightened realm”, “world-system”, or simply “the world”. To keep Chinese scholars happy, just don’t translate it as “empire”. The West had empires. China had tianxia.