So, I recently learned about this from my company's patent lawyers. Patents only give protection in countries where they are filed. So, you can not create a product in Brazil that violates a Brazilian patent. And, you cannot import a product into Brazil that violates that patent. But, there is nothing stopping you from making that product in the US and selling it to Americans. The whole treaty business essentially means that most countries have roughly equivalent laws and you can file the same patent in multiple countries if you are willing to pay the fees. What countries you pay to file in then becomes a commercial decision.