NOTE: Not meant to be taken seriously
UK: Elizabeth II of England married Hassan II of Morocco in 1953. Elizabeth died 7 years after Hassan. Hassan III was crowned, unifying the nations in 2006.
SAR: The Soviet African Republics started out as the former French colonies in 1956. Revolutions in other nations led to the unification of Africa in 1996.
USE: A huge vote was held in Europe in 2014 on the unification of the EU. Unification won by just a few hundred votes. Led by Matteo Renzi.
Ameristralia: Led by President Trump. The US and Australia decided to unite in 2015.
Sino-Indian People's Republic: India and China, a unified Democratic Socialist nation with over 2.6 billion people. Almost every surrounding nation is under their sphere of influence.
The Land of Thor: Just a bunch of Democratic Socialist Viking villages led by some guy named Gustav or Olaf. The Islamic Republic of Sweden still wants it's independence back.