Hi Abil, I would probably have written it like this: I never thought of going back to my country. However, if I had gone went back perforce or "by mistake", by force of circumstance, I would have joined a progressive political party. By the way, "by mistake" looks distinctly odd there; it's difficult to imagine how you could have gone back 'by mistake' in this context, unless you'd boarded the wrong plane at the airport.
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