What is one theme sets the modern era apart from previous time periods?

Explanation:

The theme that sets modern era apart from the previous era is the development of industrial technology. This period brought a major shift not just economically but socially and politically as well. Politically, this period saw a shift from monarchy to democracy, and social hierarchy also changed.

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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brainliest?

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.