AWS Directory Service for Microsoft Active Directory, also known as AWS Managed Microsoft AD, now supports automated, multi-region replication of your directory. Now you can deploy and use a single AWS Managed Microsoft AD (Enterprise Edition) directory across multiple AWS Regions. This makes it easier and more cost-effective for you to deploy and manage your Microsoft Windows and Linux workloads globally. With the automated multi-region replication capability you get higher resiliency, while your applications use a local directory for optimal performance.
Source:: Amazon AWS