As I haven't made my second claim: claiming the Republic of Madagascar from Red Flood
A Very Prehistoric Revolution
The war against the monarchists had been hard fought. A mixture of the monarchists plantation workers revolting en mass combined with a steady flow of military aid and advisors from the German Socialist Räterepublik into the Republic of Madagascar had finally brought the Kingdom to its knees by 1938, and the new red Republic looked forward to spending the a few years rebuilding what had been destroyed in the civil war before turning their small patch of Earth into a fairer society whilst the titans of communism clashed with the forces of reaction in Europe and Asia.
With the imperialists either distracted by events in Europe or even withering away, the Republic of Madagascar had won itself peace and, though there was some talk of liberating the rest of Africa from imperialism, Madagascar was happy to enjoy that peace.
Fate, however, had other plans.
The first thing the government noticed was the radio silence, the sound of the world outside having disappeared. The first thing the common people noticed, meanwhile, were the rats, or to be precise, the fact that they weren't there anymore.
That said, they both noticed the same thing next, and noticed it with dumbstruck expressions. It was the birds: they were flightless like an ostrich, but were taller than a man at the shoulder and with a long neck that seemed to stretch it's height to almost twice that of a man, and frighteningly they didn't seem to have learned any fear of humans. For a brief moment, the whole of Madagascan society stood still and silent in wonder and horror. Then one of the birds stole a politician's hat and got chased back into the forest by an angry farmer and the Madagascans got back to their business and back to pondering what on Earth was going on.
It wasn't that Madagascar was in dire straits: they were already fairly self-sufficient in the bare essentials as they were already isolated from their fellow socialists through geography and from the rest of the world by being socialists, and with the bounty of untouched fish stocks (and the occasional elephant bird hunt) if anything the food supply had increased since their arrival. A number of goods produced in Europe had to be rationed until localised production could be started, the 5 year reconstruction plan had to be scaled back dramatically and the opening of the new cement works had to be delayed, but it wasn't anything catastrophic. No, the questions being asked were existential: the German and Hungarian communities in Madagascar wanted to know if they had homelands to go back to, the French community wanted to know if there was still a France to seize for socialism once again, and the native Madagascans wanted a explanation as to what the bloody hell was going on.
The government of course wanted answers to those questions as well, and was most frustrated that everyone expected them to know what was going on. Salvation would come from an exiled French palaeontologist: one Jean Bassot.
Bassot had recognised the birds: they were the very much extinct elephant birds. After a few days of research, Bassot had located a number of other species: giant tortoises, lemurs and aye-ayes, all creatures science had confirmed were extinct stubbornly telling the confirmations of science to sod off. The disappearance of the rats, meanwhile, also attracted Bassot's attention, for he remembered that the rats had been brought to Madagascar by humans. Based on this, the conclusion he came to, and the conclusion he shared with the government behind closed doors, was that the Republic of Madagascar must have been sent back in time or perhaps to an Earth where humans never evolved.
It was as good an explanation as to 'what happened' as any, and for that alone the Republic of Madagascar happily went along with Bassot's request for himself and a few of his fellow scientists to go on an expedition to the shores on mainland Africa to see what life was there, but that still left the question as to 'why this happened'. This would be answered by Paul Dussac, fellow exiled French man and 'the Marat of Madagascar' who's newspaper and radicalism had helped incite the revolution in the first place.
"We have, by accident or design, gone back to a time before imperialism, capitalism, or any of the evils of which we were familiar. Though we have lost much, we have also found an opportunity: we are now free to build a world that'll never know such wretched things!"
Whilst not all agreed with Dussac's radicalism, his optimism took hold nevertheless: Madagascar had found itself in an Eden, and with that came a chance to make an Eden for its own.
This just left one question: "Is anyone else out there?"