they all belong to a manor peasant
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.
Louisiana Purchase happened in 1803, specifically, July 04, 1803. (but the celebration of July 4 remembers this day in 1776, not 1803)
Gadsden Purchase - December 30, 1853.
The difference is a round 50 years, and more specifically 50 years, 5 months and 26 days!
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I think it becomes difficult because they all wanted to have more advantages than anyone else, that became too much for the country that they defeated. The Potsdam Conference became difficult because they have problems on the things that they should do with Germany that they want to completely disarm the country.
