Answer:
Protection of important figures, military outposts, border security...
Explanation:
Named a couple, imagine what having a castle would do with the answer above.
Greece was the modern country that was a part of the Persian empire.
Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines. Eventually he adapted his engine to produce rotary motion, greatly broadening its use beyond pumping water.
