Britannia (France+britan) conquered all of Europe thanks to Napoleon. Therefore, Germany never rose to power, and the USSR/Russia stayed how it was until the East EU was formed.
According to the spoilers, all of Britain's power went to America and formed an empire, so that's why Great Britain the island re-joined the East EU. With all of Europe/Russia's power, extending the empire through Iran would be easy.
India basically never separated itself into Pakistan, etc. So they're just a huge empire as well.
America/Britannia probably pushed it's way through south america much like how the U.S. took land away from mexico, only to a much greater extent and with more force/power.
Major wars probably didn't happen because of these shifts in history. Britannia just held on to it's colonies in Africa and then took over parts of the middle east, took over Australia from the original Britain, and then pushed it's forces into the south pacific, eventually into Japan, it seems.