Earlier "neutral flags law"

What if Wilburforce passed his law prohibiting neutral flags immediatly at the beginning of the nepolianic war? would there be a benefit to slavery ended slightly earlier?
 
I'm only vaguely versed in Mr. Wiberforce abolitionist work. What was said law to have done?

It allowed privateers to board and seize from ships flying a neutral flag.

It was described as a way to stop French shipping as they often flew the American flag to avoid seizure. However, a huge amount of british slavers also flew the American flag. Since privateers wouldn't care where they were getting they're money they also raided the British slavers.
 
Seems a good way to start a war. Perhaps this starts an earlier 1812 style war? Or maybe it just behooves the US to start building a navy sooner to defend ships flying its flag.
 
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