As of today AWS RDS for PostgreSQL1 does not offer cross-region replication. Short of switching to one of the RDS offerings that do support it, there is a few options to consider.
Tag: replication
Configuring Master-Slave Replication With PostgreSQL
Having configured PostgreSQL 9.3 master/slave replication from bits and pieces of documentation on the Internet, I feel like a post … More
The Dulin Report 