Kerbin

Kerbin is the most developed of any of the planetary governments. It is currently the only planet which is overpopulated. The entire planet is covered in cities. The mun is somewhat populated, but the majority of lunar bases are for resource mining (mainly fuel and meteor iron) Minmus is comprised of many buildings for farming (mostly agricultural but also few farm animals) as well as a few launch platforms. Kerbin has few space stations due to the large amount of debris in orbit, but there are many ships in Kerbin orbit designed to turn said debris into scrap metal. Kerbin then trades this with Duna for reverse electrolysis. Whereby they remove the rust from surface dust and are able to precisely manipulate the product. Kerbin's main war strategy is to use overwhelming force. Kerbin has many more advanced technologies and a substantially higher population than any other planetary system. Kerbin is a memer of the Kerbin Confederation. Kerbin names it's ships after kerbal gods

Notable Ships
Kermes: The first ever FTL ship

Artemis: An orbiting Munar iron stockpile

Apollo: Kerbin/Duna orbiting solar power rig