1️⃣ Build VPCs both two regions
2️⃣ Transit Gateway Cross Region Peering
3️⃣ Deploy Application Layer EC2 and ALB
4️⃣ Create RDS Primary Region
5️⃣ Create Cross Region Read Replicate Secondary Region
6️⃣ Configure Route 53 Health Check Failover Routing
7️⃣ Failover Testing Route 53