Jura Tempest Federation

Jura Tempest Federation (ジュラ・テンペスト連邦国), also known as Tempest (魔国連邦) is the country founded by Rimuru Tempest in the Jura Forest.

Background
Initially founded near the Sealed Cave after abandoning an old Goblin village, the nation started off as a new Goblin village built by Dwarven Craftsmen. This village then joined with the Lizardmen, emancipated Orcs (now High Orcs), surrounding Goblins (now Hobgoblins) as well as the Dryads and Treants to create the Jura Forest Alliance which several months later evolved into the Jura Tempest Federation, kicking off the founding of the nation with a magical treaty with the Armed Nation Dwargon.

Government
At the highest executive and overall position of the Jura Tempest Federation stands the Demon Lord Rimuru.

Department of Governance and Administration
Prime Minister Rigurd is responsible for this department and holds the highest authority for internal affairs outside wartime after Rimuru. This department has several subdivisions:

Department of Military Affairs
Commander-In-Chief Benimaru is responsible for this department and holds the highest authority for all matters during wartime, but can be vetoed by Rimuru if necessary. Hakurou is the Chief Instructor.

Department of Intelligence Gathering
Spymaster Souei is responsible for this department and keeps Tempest strong on Espionage.

Department of Construction and Public Works
This department is led by Geld and Gobkyuu and deals with the construction work of Tempest during peacetime.

Department of Research and Development
This department mostly deals with technological advancements and its applications. It's led by Kaijin, Vesta, the Dwarf Brothers, Gabiru, and Kurobee.

Department of Finances and Public Relations
This department is led by Myourmile.

Dungeon
The Dungeon is managed by Ramiris and Veldora and to a lesser extent Rimuru.

Armed Nation of Dwargon:
The Armed Nation of Dwargon was the first to recognize the then called Jura Tempest Alliance as its own sovereign nation, causing the Jura-Tempest Federation to be officially formed. They entered a treaty with the newly formed Jura-Tempest Federation that included the following: There are a few other details in this treaty that haven't been brought up since. Since the signing of this treaty Dwargon has sent several researchers, including Vesta, and helped Tempest in repelling Charybdis. Dwargon was also the first country to receive Rimuru as a state guest. The two countries enjoy close ties with each other
 * 1) A Non-aggression treaty,
 * 2) A promise of assistance, in the event either nation is endangered,
 * 3) The building of a road to Dwargon, in exchange for their backing,
 * 4) Guaranteed safety for Dwarves within the Forest of Jura,
 * 5) Promises of sharing technology between Tempest and Dwargon.

Kingdom of Blumund
The kingdom of Blumund was the first human nation to recognize the Jura-Tempest Federation as a sovereign nation. They feared Tempest as a nation of monsters because they were incapable of defending if Tempest was to attack, leaving them no choice but to engage in politics. Eventually they signed a joint-security and freedom of travel treaty, the relationship between the two has been increasingly positive since. Rimuru never expected Blumund to actually help Tempest and intentionally left loopholes within the treaty for them to deny aid if they were being attacked, but much to Rimuru's surprise Blumund fulfilled their end of the treaty when Farmas marched against Tempest.

Demon Lord Milim's domain
Demon Lord Milim's Domain, formally consisting out of the Beast Kingdom Yuurazania, Harpy Kingdom Fulbrosia and the Capital of the Forgotten Dragon. Milim's Domain doesn't seem to have any written alliance with the Jura-Tempest Federation, the relationship between the two seems to be entirely dictated by the friendship between Rimuru and Milim Nava and the whims of the latter. Before Carrion stepped down as Demon Lord, Yuurazania and Tempest signed a non-aggression treaty and pursued trade relations. After Milim destroyed the capital of Yuurazania Tempest has sheltered the refugee beastmen and helped with the construction of a new capital city.

Trivia

 * As no other continents have been revealed/discovered, the Jura Tempest Federation unofficially serves as the center of the world the story takes place in; the map of the known world shows the Forest of Jura to be in-between most major countries.