Interchangeable parts are parts (components) that are, for practical purposes, identical. They are made to specifications that ensure that they are so nearly identical that they will fit into any assembly of the same type. One such part can freely replace another, without any custom fitting (such as filing). This interchangeability allows easy assembly of new devices, and easier repair of existing devices, while minimizing both the time and skill required of the person doing the assembly or repair.
The concept of interchangeability was crucial to the introduction of the assembly line at the beginning of the 20th century, and has become an important element of some modern manufacturing but is missing from other important industries.
There also people that think WW1 was the first modern war.
But the reason for people to believe that the fist modern war was the civil war is because it was the first war after the industrial revolution, that also meant more technology and advancement were made, and last it was because these new technology's resulted in more deaths than any other American war.
Humphrey won the party's nomination at the Convention on the first ballot, amidst riots in Chicago. He selected little-known Senator Edmund Muskie of Maine as his running mate. During the general election, Humphrey faced former Vice President Richard Nixon of California, the Republican Party nominee. :D hoped this help a bit
Labor. People have always been an important resource in producing goods and services, but many people are now being replaced by technology.
