Mangled: How the Apocalypse Began

It started in North America, mainly in the United States. Relations with North Korea were plummeting, and a string of weak and corrupt rulers caused chaos in the East. Eventually, a nuclear war began, which ultimately destroyed North Korea, parts of South Korea, Japan, southwestern China, and the western United States. A nuclear winter began, making northern lands like Scandinavia uninhabitable due to the sheer cold. The weather caused some still inhabitable countries to go into a medical epidemic of influenza, where only the luckiest of the healthy and wealthy survived. Due to the drop in farmable land, some countries go into famine.
While other continents vanished, Australia and some parts of Africa survived in the desert, where the virus dies out. Eventually the weak died off, leaving only the strongest of the strong to survive. Two influential people created powerful militias in Australia, while others flee and try to rebuild the shambles of the world.
Soon the nuclear winter subsides, but the armies in Australia stayed and fought for the right to the land.
People try to rebuild the world as it becomes habitable again, but it is increasingly difficult due to mutated creatures and diseases. Luckily there are no epidemics, and eventually, a government rises in India. Nobody dares set foot in Australia, but the sunken continent called Zealandia rises again, creating suitable farmland. Unlucky people were kidnapped by the two militias to add on to armies.
Just some filler crap. Hopefully, this makes sense.