They used interchangeable parts. This made the mass production possible and caused it to happen.
He Great Compromise was forged in a heated dispute during the 1787 Constitutional Convention: States with larger populations wanted congressional representation based on population, while smaller states demanded equal
Japan was able to recover so fast due to the Korean War. There was a huge surge of United Nation and United States troops that provided money and jobs. Japan was able to serve as a repair hub as well as a logistics base during that time.
Different map projections are necessary because they were created to address different situations. Cartographers are the professionals that elaborate map projections. They do it in order to have a visualization of the Earth Surface.
We can’t have just one map projection because there is non-single map that creates a perfect image of the Surface of the Earth. That is why cartographers need various maps to overcome the problem of distortion. It could be areas distortion or distances distortions. Different maps help to meet distinct needs.