Staying with useless DeSoto trivia, I asked it this... "What was a DeSoto Diplomat?"
It came back with "As far as I know, there is no such thing as a "DeSoto Diplomat." DeSoto was a brand of car that was produced by the Chrysler Corporation from 1928 to 1961. However, during that time, there was no model or trim level called the "Diplomat."
It's possible that you may be thinking of the Chrysler Diplomat, which was a model produced by the Chrysler Corporation from 1977 to 1989. The Diplomat was a mid-size car that was based on the Dodge Aspen and Plymouth Volare platforms. It was sold under the Chrysler brand in the United States and under the Plymouth and Dodge brands in Canada. However, there was no DeSoto version of the Diplomat."
I thought it was interesting how it started off the neutral language of "as far as I know..." rather than just a definitive "No." And it got the '77-89 car mostly right, except it was a DODGE Diplomat.
Anyway, I then responded with "It was an export model".
And surprisingly it came up with "I apologize for the confusion in my previous answer. To the best of my knowledge, there was no DeSoto Diplomat model produced for the domestic (US) market. However, there was a DeSoto Diplomat model that was produced specifically for export markets, particularly for European markets.
The DeSoto Diplomat was a version of the Dodge Kingsway that was produced for export under the DeSoto brand. The Kingsway was a model that was based on the Plymouth platform and was produced by Dodge for export markets. The Diplomat was essentially a rebadged Kingsway with some styling changes to differentiate it from the Dodge model.
The DeSoto Diplomat was produced from 1946 to 1960, and was offered with a range of engines and body styles, including sedans, coupes, and station wagons. However, the Diplomat was never sold in the United States, and was primarily marketed in Europe, particularly in countries such as France, Belgium, and the Netherlands."
That's actually mostly right. I don't know much about the Dodge Kingsway. However, for a lot of export markets, Chrysler would take the Plymouth and rebadge it as various Dodge names (Kingsway, Crusader, Mayfair etc) or DeSoto (Diplomat) and sell it in various export markets. The rationale for this was that the name "Plymouth" had very little meaning outside of the United States, but "Dodge" was more well known, and "DeSoto" had that European flair. However, the US Dodges and DeSotos were too big...although by foreign market standards even the Plymouth wasn't exactly petite.
The only error I can think of is that there actually was a DeSoto Diplomat in 1961-62. However, by that time it was just a Dodge Dart with a slight trim shuffle. They didn't even try to make it look like a Desoto up front. But, it's possible by that time, Chrysler was scaling back availability of the Diplomat, since DeSoto ended US production in late November, 1960. The name "DeSoto" persisted on export market trucks for awhile, and eventually was sold to a Turkish company, and I believe they still use it to this day.