main.tf

module "primary_us_vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "4.0.1"

  providers = {
    aws = aws.us-east-1
  }

  name            = "vault-us-east-1"
  cidr            = "10.64.0.0/22"
  azs             = ["us-east-1a", "us-east-1b", "us-east-1c"]
#  public_subnets  = ["10.64.0.0/25", "10.64.1.0/25", "10.64.2.0/25"]
  private_subnets = ["10.64.0.128/25", "10.64.1.128/25", "10.64.2.128/25"]

  enable_nat_gateway   = false
  single_nat_gateway   = false
  enable_dns_hostnames = true
}

module "secondary_us_vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "4.0.1"

  providers = {
    aws = aws.us-west-2
  }

  name            = "vault-us-west-2"
  cidr            = "10.64.4.0/22"
  azs             = ["us-west-2a", "us-west-2b", "us-west-2c"]
#  public_subnets  = ["10.64.4.0/25", "10.64.5.0/25", "10.64.6.0/25"]
  private_subnets = ["10.64.4.128/25", "10.64.5.128/25", "10.64.6.128/25"]

  enable_nat_gateway   = false
  single_nat_gateway   = false
  enable_dns_hostnames = true
}

provider.tf

terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
    }
  }
}

provider "aws" {
  alias  = "us-west-2"

  region = "us-west-2"
}

provider "aws" {
  alias  = "us-east-1"

  region = "us-east-1"
}