Eurasiatic "empire"

"The closest humanity has gotten to a truly united Earth"
It is the year 9000 AD, humanity has become a type 2 civilization and colonized the solar system establishing many extraterrestrial countries. The Eurasiatic "empire" (sometimes referred to as a macroempire, pseudo-empire or semi-empire) is a supermassive multi-continental country that encompasses most of Eurasia, the Americas, Carribean, Southern Africa and Australia. In fact, this "empire" is more of a "phylum" of many different republics, regional areas, smaller states and etc within its borders. This country isn't ruled by one leader or royal family, but rather many different high government officials in charge of different regions of the country. (For example, the Australian region is ruled by a different person than the European region) It is mostly a mixture of monarchy and democracy. It encompassed 55% of the Earth's total land area, It has a population of 7.4 billion, GDP of $356 trillion, GDP per capita of $250,115 and a HDI of 0.995 (very high).
=== History ===
The empire was first proposed in 4035 AD by a German-British king as a union of the Indo-European and Altaic empires, encompassing more of Eurasia, however, it was scrapped and forgotten. Until 200 years later, when an alien civilization threatened to invade the Earth, many Europeans agree on uniting both empires in order to create a strong military to defend them and fight the aliens. 
In 6102 AD, the empire expanded, incorporating most of Siberia, the Indian subcontinent and North America into it.
7334 AD, South America, Australia and Southern Africa joins the union,
=== Geography ===
As afromentioned, the country makes up 55% of Earth's total land area (around 280.5 million square kilometers) and incompasses The Americas, most of Eurasia, Southern Africa and Australia. Due to its large size, it has a wide variety of landscape and climates, ranging from cold, dry and flat in northern Alaska to tropical and warm in Queensland. 
The country is also divided into several regional districts / federal subjects ruled by different officials. The country also has many different capital cities for each region. E.g: The capital for Siberia is Novosibirsk and the capital for Australia is Canberra
List of regional districts / federal subjects in the country:
# Germany
# British isles
# Scandinavia
# Francia
# Iberia
# Italy
# Balkan
# Ukrainia
# Baltica
# Romania
# Uralia
# Yakutia - Krasnoyarsk
# Primorsky
# Outer Mongolia
# Kazakhstan
# Afghanistan
# Pakistan
# Iran
# Caucasia
# North Caucasia
# Uttar Pradesh
# Bengal
# Tamil Nadu
# Iceland - Greenland
# New England
# Alaska
# Cascadia
# California
# Texas
# Ohio
# Florida
# Mexico
# Costa Rica
# Carribea
# Brazil
# Peruvia
# Argentina
# Gran Colombia
# Australia
# New Zealand
# South Africa
=== Demographics ===
This country is also very ethnically and culturally diverse, as Indians make up most of the country's population, with only around 18%, followed by Americans with 16.7% and Brazillians with 8.8%. Over 1000 different ethnic groups are recognized within the country's borders.