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<span> Military spending that began in 1940 to bolster the defense effort gave the nation’s economy the boost it needed, and millions of unemployed Americans returned to work to make the weapons of war needed to protect the United States
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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.
Answer:
Four Empires: Russian, German, Austria-Hungary and Ottoman disappeared, new countries were created, while Germany lost all its colonies.
Explanation:
When war ended, the peace conference in Versailles created new borders, mostly in Europe. German Empire disappeared and on the soil of it Weimar Republic was established. Austria-Hungary was also dissolved and many new countries were formed on its soil, including Austria, Hungary, Kingdom of Serbs, Croats and Slovenians. Ottoman Empire also disappeared and many countries including Turkey were created. Russian Empire also disappeared and new countries including Finland, Poland were created. Germany lost colonies that were mostly given to France and Britain.
