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AWS Security Hub adds support for cross-Region aggregation of findings to simplify how you evaluate and improve your AWS security posture

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