Rome established a republic :
after it overthrew its last emperor.
after it overthrew its last Etruscan king.
when it was at the height of its power.
when it converted to Christianity.

Question

Rome established a republic :
after it overthrew its last emperor.
after it overthrew its last Etruscan king.
when it was at the height of its power.
when it converted to Christianity.

anonymous · Answer

The Republic came first, the Empire came afterward, so that rules out 1.  Rome was at the height of its power as an Empire, so that rules out 3.  Christianity became the state religion with Constantine in roughly 315 AD, so that rules out 4.  (The Empire was founded in roughly 1 AD by Octavian.)  You're  left with 2, which is perfectly reasonable.