You can join the Kebabs, it's more powerful than a fresh new kingdom
Other kingdoms too:
Lemon Kingdom- Never goes to war, but has supposedly "unbreakable defenses". All Techs are safe there (unless you get kicked out)
Kiwi Kingdom- Gets the most combat action of any other kingdom, but is enemies with pretty much every other kingdom in existence.
TAC- Has a giant war-spaceship. Development of this kingdom is very slow however. (May have been the source of inspiration for "RP battles")
*might* have inspired the creation of the kingdoms below.
UESO- Huge space kingdom, but needs new citizens to expand as it has very little.
Duck Kingdom- Just reached space and the "moon". Best place for aircraft.
Chaos Continuum- Freed rules and every citizen has control over the kingdom.
Kebab Kingdom- Currently the "hottest trending kingdom" right now, with people commonly joining it. Well known for its good confident attitude towards things.
Silver Fleet Systems and
Titanium Gear- Both mercenary kingdoms of sorts