Napoleon's conquest of Spain weakened it and gave the colonies an opportunity to rebel. This answer is considered perfect by many researchers and historians as per the available sources and evidences.
It is considered that, in the initial times the Spain and France were allies, as Napoleon wanted to invade into the territories of Portugal, he asked for support from Spain.
Spain was also curious about securing the southern boundaries in Portugal, thus co-operated, but it turned out to be disastrous as, Napoleon Bonaparte betrayed and annexed Spain along with Portugal.
This step had further weakened the control over the colonies of Spain, and their emerged a rebellion for their independence, and thus it can be said that, indirectly, Napoleon had helped the Spanish colonies in America.
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