Please help - websites block list.

Hey guys!

I was running some campaigns here in Brazil and I realized that my ads were being displayed in A LOT of websites from other countries/pleaces (USA, Europe and so on...), then I started blocking all of them on account level, so they wouldn't use my budget for nothing.
Yesterday I decided to start announcing products from ClickBank to the american public... the campaign is active and running, but it wasn't flowing really nice, so I realized that there were MORE than 600 websites - mostly from the USA - blocked on account level, something that is really bad for this specific campaign that aims a public from the USA.

Then I tried to delete some of these 600 websites, so they can display my american Ads, but I would like them to stay blocked on my Brazilian ads. And what happened then?

"If you remove this website from the list, it will be unblocked for all your account"... and it would include my campaigns that aims only brazilians.

Omg, what can I do? I would like to remove all the american websites from this specific campaign, but they are blocked on account level and if I remove them, they will be allowed also for my brazilian campaigns (wasting my budget).

How can I solve this? How can I have different website block lists and run differente ads targeting different countries?

Should I add these 600+ websites on "CAMPAIGN block level" and always when I need to announce a new product, I have to duplicate the original campaign to have all the blocklist on campaign level?

Please help, I'm quite confused with this part.

Thanks a lot.