Terra nowadays is significantly different. If you put a recent map beside one from the 21st century, the differences would be very obvious - and that's in large part due to mass unification efforts, which stem from centuries of geopolitical upheaval, conflicts, and economic necessity. These have transformed Terra’s political landscape into one dominated by regional superstates, each formed in the aftermath of conflicts such as WW3 and the Resource Wars in the 24th century.

Korea
The reunification of Korea was one of the first major geopolitical shifts. North Korea had taken a significant toll after the events of World War 3. The country was at an all time low, and once they were hit with major sanctions, the country collapsed economically and politically. South Korea, driven by economic opportunity and a desire to restabilize the region, ended up absorbing its territories, unifying both sides and forming the Unified Republic of Korea.

Fragmentation of Russia
Following World War 3, Russia's territorial integrity had diminished immensely. Internal disputes, economic hardships, and external pressure from neighboring regions led to the independence of several of it's regions. While Moscow retained control of the western territories (plus Siberia), much of the eastern region broke off, creating a series of independent states.

Can-Am
The most significant unification to come out of the Resource Wars is that of Canada and the United States. Now recognized officially as Can-Am, the merger was born from mutual benefit, as the two realized that pooling their resources & infrastructure would be the ideal path forward. This was further solidified by their common security concerns and economic interdependence.

Can-Am operates under a federal system where former states and provinces maintain some degree of autonomy, while key policies - such as defense, trade, and foreign relations - are handled at the central government level.

Gurūpu
In Southeast and East Asia, a political entity emerged: Gurūpu. This was the proposition of a union between most of SEA and EA, and came about as a reaction to the instability following the Resource Wars, when the region experienced major economic downturns. Paired with increasing territorial disputes surrounding the region, it was imperative to them that they needed to find a solution.

Gurūpu was formed through diplomatic agreements, mutual defense pacts, and economic cooperation amongst nations like Japan, Korea, the Philippines, and various other countries.

United European Alliance
Europe saw significant transformation near the tail-end of the Resource Wars, when most of the EU had merged into a single entity: the United European Alliance (UEA). This unification had similar intentions to Gurūpu, where European nations sought out to find solutions to external threats and economic challenges.

The UEA is a supranational entity, governing most of Europe (with the exception of Fennoscandia and a handful of other countries that preferred to remain independent). It is structured similarly to the EU, but with a more centralized government handling all key affairs.

South Atlantic Federation
The South Atlantic Federation (SAF) formed as a result of other nations merging into superstates. Not wanting to be significantly overpowered, South American nations - namely (but not limited to) Brazil, Argentina, and Chile - merged to counterbalance the growing influence of other superstates; mainly Can-Am to it's north.

Superstates have drastically altered the dynamics of international relations. With entities this large on the playing field, diplomacy becomes a game of balancing each superstate's different interests. While these major powers negotiate terms of global resource distribution, smaller nations who remained independent struggle to maintain a sense of stability.

Superstates marked the end of a more diverse Terra. With these smaller nations lacking the economic, military, and diplomatic resources of these giants, it's only a matter of time before they join them.