Explain how rome officially becomes in empire?

It largely depends upon your definition of 'empire'. If you mean 'empire' to mean an autocratic state, then it began when Octavian Caesar (a.k.a. Augustus Caesar) became the first emperor of Rome in 27 BC. The transition from republic to empire in that sense didn't just happen overnight however.

d. the great plains       hop3 this yo

the han greatly expands the chinese empire. the han dynasty retains the centralized bureaucracy and unified political system of the qin but adopts and grafts upon this the confucian view that government should be run by educated, ethical men.

explanation: