Answer:
Electricity
Explanation:
The second industrial revolution was contributed by the increase in electricity
Answer: Pride of Islam and center of learning , beautiful city. the city evolved into a significant cultural, commercial, and intellectual center of the Muslim world. This, in addition to housing several key academic institutions, including the House of Wisdom, as well as a multiethnic and multi-religious environment, garnered it a worldwide reputation as the "Center of Learning".
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The answer:
Territorial expansion