You can now use AWS Resource Access Manager (RAM) in the South America (Sao Paulo) region to securely share your AWS resources across AWS accounts or within your AWS organization. You can centrally create resources in a multi-account environment, and use AWS RAM to share those resources across your accounts. This reduces operational overhead while maintaining the benefits of a multi-account strategy. At this time you can use AWS RAM to share Amazon VPC subnets and traffic mirror targets in South America (Sao Paulo) region, eliminating the need to create duplicate resources in each of your accounts and driving down costs. To learn more see AWS Resource Access Manager.
from Recent Announcements: https://aws.amazon.com/about-aws/whats-new/2019/11/aws-ram-now-available-in-sao-paulo-region/