The pax romana ended in 180 ce after over one hundred fifty years in existence. the end of this era ushered in a period of

D. political instability.

The Pax Romana also perceived as  Roman Peace was a time of relevant union and security beyond the Roman Empire which continued for over 200 years, commencing with the reign of Augustus (27 BCE - 14 CE).

During the survival of both the Roman Republic and Empire, the boundaries of Rome continuously extended. Most of the chroniclers accept that the Pax Romana concluded in the year 235 C.E. with the commencement of a time recognized as the 'Crisis of the Third Century,' which originated with the murder of Roman Emperor Severus Alexander by his own companies.

whose power in the senate is equal to the power of the speaker of the house?

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do