Answer:
the ans might be option d ..
Steel was important to industrial growth after the civil war because it was used to make steel rails for railroads. <span>n the years between the </span>American Civil War<span> and the end of the nineteenth century the modern U.S. industrial economy developed on the backbone of a good transportation infrastructure mainly railroads that were developed from steel.</span><span>
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The answer is Barack Obama
Hagia Sophia is the most famous example of the Byzantine architecture, and has been both a Christian Church and an Islamic Mosque. Therefore, the option D holds true.
<h3>What is the significance of Hagia Sophia?</h3>
Hagia Sophia is an Islamic Mosque situated in the beautiful city of Istanbul, Turkey. It is known for its beautiful architecture. The building of the mosque was built during the reign of Byzantine Empire. It was initially built as a church, and after the end of their empire, it was converted into a mosque.
Therefore, the option D holds true and states regarding the significance of Hagia Sophia.
Learn more about Hagia Sophia here:
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