AWS Security Hub now allows you to designate an aggregation Region and link some or all Regions to that aggregation Region. This gives you a centralized view of all your findings across all of your accounts and all of your linked Regions. After you link a Region to the aggregation Region, your findings are continuously synchronized between the Regions. Any update to a finding in a linked Region is replicated to the aggregation Region, and any update to a finding in the aggregation Region is replicated to the linked Region where the finding originated.
Source:: Amazon AWS