I think that its a fair assessment that "America's Sidearm" is/should be the 1911.
Recently discovered we have a Colt 1911 U.S. Navy in the family. Produced in the year of 1912. 4 digit serial number matches on slide and frame. Barrel turned out to be from 1915. It is retired now that it is known what it is, I did put a few rounds through it before we fully realized its value. The century tested design did as expected in a century old 1911 and it performed perfectly.
It is a great design, one that has been proven through more than a century of use all over the world and is still in use today with very little different about it today. It just works, has worked, and will continue to work as a reliable platform to shoot .45 acp for the foreseeable future.