What is one theme that sets the modern era apart from previous time periods?
O A. The colonization of foreign lands
O B. The development of industrial technology
O c. The establishment of global empires
O D. The economic isolation of world economies

B. The development of industrial technology

Explanation:

I got this answer because back then in the Slavery and Great Depression era they did not have all the type of technology that we do now in the 21st century

which time period is this? or is this story fictional, i'm going to need more info to answer this question

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