Two inventions from the World War two are the radar and the sonar, both of which had a huge impact in the war, but also after it, becoming a widely used devices all over the world.
The radar was an invention that was enabling detection of objects in the air. Initially it is was used for detection of planes, as that's where the biggest threat was coming. This device enabled the soldiers and the civilians to be warned about the oncoming danger, but also to be able to respond adequately to the threat.
The sonar was another invention inspired by the war. It had the same basic purpose as the radar, just that it was used for detecting objects in the water. This was a crucial instrument that gave the submarines big advantage in locating the enemy and destroying it, or if not capable of that, being able to move away and avoid it.
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In an absolute monarchy, the monarch is an autocrat who has complete control over the state and government, including the authority to rule by decree, issue laws, and administer punishments. The monarch's power under a constitutional monarchy is limited by the constitution.
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Many immigrants from Europe began working in factories and producing goods used by people in the North. Many factories began producing textiles (cloth) with the cotton grown in the South. The economy of the South was based on agriculture.
Romans valued loyalty and discipline.
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Using a system of relationships called feudalism, the Zhou increased the stability of the government. Under feudalism, the king owned all the land. He, the king, gave large pieces of the land to loyal supporters, called lords. In exchange, these lords sent soldiers to fight against enemies who threatened their king.
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