The Achaemenid Persian Empire: A. Had approximately 35 million inhabitants at its largest
B. Included approximately 70 ethnic groups
C. Imposed Zoroastrianism on conquered territories
D. Executed all male members of ruling families in areas it conquered in
order to lessen the chance of rebellion

A. Had approximately 35 million inhabitants at its largest.

Explanation:

The Achaemenid Persian Empire was one of the largest throughout history. It occupied about 46% of the world civilization at that time, so that about 35 million people lived within the empire's borders. The founder of the empire was Cyrus the Great. The empire included parts of as many as three continents of Asia, Africa, and Europe.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

which

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the problem not the