Explain how you would implement a multi-region active-active setup.

Multi-region setup: 1) Deploy identical infrastructure in multiple regions, 2) Use Route 53 for DNS failover and load balancing, 3) Implement data replication (RDS cross-region, DynamoDB Global Tables), 4) Use CloudFront for global content delivery, 5) Monitor health across regions, 6) Handle data consistency challenges, 7) Test failover procedures regularly.