Osea, officially the Osean Federation, is a large country and international superpower located on the Osean continent. Osea encompasses a majority of the continent's western landmass, and shares land borders with Belka, Ustio, and Sapin to the east, and an unknown country to the south. Its capital, Oured, is located on the tip of Osea's southeastern peninsula near Oured Bay.

Osea is a highly developed country that possesses a large population, extensive infrastructure, thriving economy, and well-outfitted military force. It has a democratic government, holding presidential elections every five years. The President does not hold supreme power over the government, the power instead being spread across the legislative, executive, and judicial branches, whose powers are vested by the Osean Constitution in the Congress, the President, and the federal courts, respectively.

By virtue of its world power, Osea also holds expansionist ideologies. It has been involved in multiple conflicts with the smaller countries to its east, most notably Belka and Yuktobania, the other world Superpower to the west, and even Equestria at some points, though the two countries have been allies for the past fifty years. It has also attempted to annex southern Usean countries through the Spring Sea Treaty, which failed due to the Usean Continental War.

Early history
The country of Osea is known to have existed prior to the 20th century. According to navigational charts from the early modern era, several Osean cities, such as Oured and Bana City, have existed for quite some time.

Osean War
For five years in the early 20th century, Osea and Belka entered open war. During the war, Belka became the first country to use aircraft for warfare. Osea followed suit, matching the newly-created Belkan Air Force with the Osean Air Defense Force.

Cold War
Over the course of the mid-20th century, Osea flourished and began to expand its political influence around the globe. By the 1980s, Osea was in the midst of a cold war with the Union of Yuktobanian Republics, its rival superpower across the Ceres Ocean. It was during this time that Osea and Equestria signed the Canterlot Pact, agreeing that the two Superpowers would put their past conflicts and differences aside and work together to counter the growing Yuktobanian threat. Due to Equestrias close proximity to Yuktobania, Osea was particularly interested in basing a large military presence in their country, to be used as a staging area in case of war. Equestria agreed to the construction of three military bases on their southern coastline, as well as ICBM bases, on the agreement that Osea would supply them with their advanced technology, military equipment, and protect them in case of invasion.

As part of the Cold War, Osea began to heavily expand its military, particularly its Air Force, by acquiring new recruits. Osea's Rearmament Declaration of 1990 in October 1990 shifted around some of its personnel between the branches, and created new units, while also supplying its Allies with some of their technology, in case total war broke out. Osea also commissioned the creation of a new aircraft carrier, the OFS Kestrel, in 1991. The ship was completed four years later and became the flagship for their 4th Naval Fleet.

Around this era, Osea was also surveying the world for potential troves of natural resources. Looking eastward, Osea had reason to believe that underground resources were present in Belka's southeastern region, the area now known as Ustio. Belka was undergoing economic turmoil at the time, so Osea took advantage of the situation. The country helped push for Ustio's independence, which was successful in May 1998. Osea also purchased pieces of land from Belka, most notably the Five Great Lakes and intersecting islands between the two countries. This brought several Belkan cities such as Wesson and Rutherford under Osean control.

Osea offered a joint expedition with Belka to explore potential natural resources around the Five Great Lakes, where Belka would get to share the profits. Belka agreed, but the company quickly collapsed; Osea had exaggerated on the amount of resources in the region, and Belka's economy was further destabilized. Anti-Osean sentiment heavily grew within Belka as a result.

Belkan War
In March 1995, Belka declared war on all of its neighbors and invaded much of the territory Osea had acquired in the Great Lakes sale. In response, Osea created the Allied Forces, a temporary alliance between Osea and two other countries Belka had invaded: Ustio and Sapin. Surprisingly, Yuktobania and Equestria joined the Allied Forces as well despite being located on the opposite side of the globe, which began the process of reconciliation between Osea and Yuktobania. The Allied Forces signed a nonaggression treaty, agreeing to only act in self-defense and not to invade Belkan territory.

On April 24, Osea launched Offensive Campaign No. 4101 with its 3rd Osean Naval Fleet (including the OFS Kestrel, which was undergoing sea trials), supported by the Equestrian Lunar Fleet and the carrier REN Harmony to capture the Futuro Canal and open a sea route into Belka. From there, Osea's 101st and 122nd Airborne Divisions, supported by Ustio's mercenary Galm Team, performed a paratroop operation to secure Solis Ortus and liberate Directus, the capital of Ustio.

In late May, Osea received intel that Belka was developing a new weapon of mass destruction known as V2. Using V2 as casus belli for self-defense, Osea spearheaded an invasion into Belkan territory. Belka used the Excalibur laser tower in retaliation against the invading troops, prompting the Allied Forces to send Galm Team and Crow Team, escorted by Equestrias 231st Special Assault Squadron, the Wonderbolts, to destroy Excalibur.

On May 28, the Allied Forces permanently abrogated the nonaggression treaty at the Assembly of Nations, and simultaneously launched an assault to capture Area B7R, a strategic and symbolic area for Belka. With the help of Galm and Crow Teams, despite Belkan reinforcements, the Allied Forces captured B7R. Osea then performed a bombing raid on Hoffnung to cripple Belka's industrial power, and began marching through the Waldreich Mountains towards Sudentor.

During a skirmish at Sudentor on June 6, Belka detonated seven nuclear warheads in the Waldreich Mountains, killing over 12,000 civilians. Osea, the other Allied Forces members, and Belka agreed to an immediate cease-fire. Despite remnant resistance over the next month, the Allied Forces and Belka signed a treaty in Lumen to officially end the Belkan War on June 20. The treaty was one-sided and heavily favored Osea; the country annexed the entire state of South Belka and renamed it "North Osea", despite heavy criticism from Equestria and the international counsel.

Era of Peace
In 1996, Osea signed a bilateral agreement with Yuktobania and Equestria that officially ended the Cold War. The bases that had been constructed were all turned over to Equestria, and all three countries agreed to cease development of any "superweapons", nuclear or otherwise.

On April 20, 1996, the Federation of Central Usea announced the existence of the Ulysses 1994XF04 asteroid. Refugees began immigrating out of the Usean continent; Osea's capital, Oured, accepted the largest number of refugees compared to other cities. Osea expressed desire to assist Usea in building Stonehenge but could not due to post-Belkan War reconstruction.

The next year, a group of southern Usean countries decided to join the Osean Federation. Despite backlash from their neighbors, Osea extended an offer of military allegiance, known as the Spring Sea Treaty. The treaty was to be signed on May 30, 1997, but that day, extremist terrorists took control over the entire continent. The ensuing Usean Continental War implied that Osea ultimately did not sign the treaty.

In the aftermath of the war, it was revealed that several Equestrian squadrons had aided the Rebels, and Osea began to suspect Equestria of plotting against them. Though Equestria denied the accusation, stating that the squadrons were mercenaries who did not fly for them, the distrust began to grow.

Then, on September 23, 2010, unknown aircraft were spotted approaching Sand Island Air Force Base...

Might go somewhere with this idea, might not, who knows.

6150366 On the flag
What is the little star for ?

6151369
¯\_(ツ)_/¯

But why use our years? Make up your own calender :)
https://docs.google.com/spreadsheets/d/1wOyuKmDk7nNPvZo1QUlgbb0DWSb_NqA4nE9JoRmunkw/view#gid=0
Here's one by Meep the Changeling. It's a very good calender, and has references to previous generations and such!

Also, that map literally just has greenland, iceland, several canadian northern islands, and the great lakes pasted in. Very, very lazy. Not to mention what the map means. Does it have six territories? What do the six stars mean? Why is it blue and white? Not to mention Balka is very similar in name to the Balkan region.

6150366
Sounds like retelling of WW2, if Germany were next to USA.
Osea - USA.
Belka - Germany.
Ustio - Poland.
Yuktobania - USSR.
Equestria - England.

Of course, USA ending up expecting ENGLAND to have invasion plans afterwards is pretty... curious.

6156729
Hey, don't look at me man, I'm not the one who made it.

6160565
I didn't make most of the backstory, I only added in Equestria after the fact
(http://acecombat.wikia.com/wiki/Osea)

6160848
You didn't even make it yourself? Jeez, I can make a map and I use iphone image editors.

6179122
Map was taken from here:
http://acecombat.wikia.com/wiki/Strangereal