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A Socialist Spain in 1909?

I was reading a bit around, and I came upon an interesting idea for an alternate timeline: the Semana Trágica. It was a conflict between the far left and the military in 1909, leading to a lot of bloodshed. I have two questions:

What PoD could have plausibly caused the Semana Trágica to result in a successful overthrow of the Kingdom of Spain?

And how would a socialist Spain have reacted to the unfolding events of WWI?
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