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Or to be more specific. What would be the butterflies of the Hapsburgs if they did not have access to the Great Silver Mines of their Spanish Empire? Either by not discovering them or they being under their control. If they are not under Spanish control for a period or they gain them latter.
One of the more obvious butterflies would be in regard to the Chinese Trade. The Ming inflated and oversold themselves into financial corruption and collapse as a result of importing mass quantities of New Spanish Silver. They flooded Mexico with Silk that created a vast texilte industry and had European powers bickering each other for control over trade in the region. No Manila Galleons.
Other butterflies may include the Reformation or the Ottomans.