Actually, Kansas City was originally totally in Kansas. When heading west on the Santa Fe Trail (originally) they would cross the Missouri River then immediately camp, waiting until the next day or the rest of their train to cross before beginning the trek. The whole area became known as Kansas City.
Also the eastern state line of Kansas was originally supposed to go all the way north and encompass that diagonal of Missouri. Various political concerns weighed in changing the line. The most important one was having as much of a navigable river within your state (Missouri) as possible and not exclude it from another (Kansas).
The funny thing for us living in Kansas, is that most of Kansas City, including the airport, the football/baseball stadiums are in Missouri. The dumb thing is that Kansans in the area voted to raise a sales tax that goes to Missoui. We are nothing if not gullible.
Who wrote "Im Goin To Kansas City..KansasCity Where I'm From.." ?