diff --git a/.changelog/33369.txt b/.changelog/33369.txt
new file mode 100644
index 00000000000..e5668083f6c
--- /dev/null
+++ b/.changelog/33369.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_redshift_cluster: Fix `unexpected state` errors on resource Create
+```
\ No newline at end of file
diff --git a/internal/service/rds/instance_automated_backups_replication.go b/internal/service/rds/instance_automated_backups_replication.go
index 8f07da3b131..8643e947114 100644
--- a/internal/service/rds/instance_automated_backups_replication.go
+++ b/internal/service/rds/instance_automated_backups_replication.go
@@ -7,6 +7,7 @@ import (
 	"context"
 	"log"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
@@ -23,10 +24,11 @@ import (
 	"github.com/hashicorp/terraform-provider-aws/internal/verify"
 )
 
+// AWS flip-flop on the capitalization of status codes. Use uppercase.
 const (
-	InstanceAutomatedBackupStatusPending     = "Pending"
-	InstanceAutomatedBackupStatusReplicating = "Replicating"
-	InstanceAutomatedBackupStatusRetained    = "Retained"
+	InstanceAutomatedBackupStatusPending     = "PENDING"
+	InstanceAutomatedBackupStatusReplicating = "REPLICATING"
+	InstanceAutomatedBackupStatusRetained    = "RETAINED"
 )
 
 // @SDKResource("aws_db_instance_automated_backups_replication")
@@ -189,7 +191,8 @@ func FindDBInstanceAutomatedBackupByARN(ctx context.Context, conn *rds.RDS, arn
 		return nil, err
 	}
 
-	if status := aws.StringValue(output.Status); status == InstanceAutomatedBackupStatusRetained {
+	// AWS flip-flop on the capitalization of status codes. Case-insensitive comparison.
+	if status := aws.StringValue(output.Status); strings.EqualFold(status, InstanceAutomatedBackupStatusRetained) {
 		// If the automated backup is retained, the replication is stopped.
 		return nil, &retry.NotFoundError{
 			Message:     status,
@@ -260,7 +263,8 @@ func statusDBInstanceAutomatedBackup(ctx context.Context, conn *rds.RDS, arn str
 			return nil, "", err
 		}
 
-		return output, aws.StringValue(output.Status), nil
+		// AWS flip-flop on the capitalization of status codes. Convert to uppercase.
+		return output, strings.ToUpper(aws.StringValue(output.Status)), nil
 	}
 }