Which war began the modern era?
world war i
the american civil war
world war ii
the chinese civil war

World War I  began the Modern Era. Option A is correct.

The modern era is the linear, global, historiographical approach to the time frame after post-classical history. Modern history can be divided into distinct periods:

The early modern period began approximately in the early 16th century; notable historical milestones included the European Renaissance, the Age of Discovery, and the Protestant Reformation. Besides, the late modern period began approximately in the mid-18th century.

b

explanation: