Respuesta :
"Threat of invasion" was not a problem among the following choices that are given in the question that Roman Empire faced as it started to weaken after the period of Pax Romana. The correct option among all the options that are given in the question is the third option or the penultimate option.
The correct answer is A) worker strikes.
What was not a problem faced by the Roman Empire as it started to weaken after the period of Pax Romana was "worker strikes."
The Pax Romana started in 27 BCE and ended in 180 CE. It was a time of relative peace in Rome. Peace allowed the growth and prosperity in the Roman Empire. Order and economic stability were two main reasons to maintain peace for 200 hundred years. Things started to complicate after the assassination of Julius Caesar. Marcus Aurelius was the last emperor of the Peace Romana time.