"So we make this big loan, most of it comes back to the United States, the country is left with the debt plus lots of interest, and they basically become our servants, our slaves. It's an empire. There's no two ways about it. It's a huge empire. It's been extremely successful"

John Perkins is describing the means the United States has utilized its economic power to affect various other countries. By making huge loans to various other nations, the US has the ability to gain control over them. The nation is left with the debt plus great deals of rate of interest, and they come to be based on the United States for payment. This develops a situation where the US has a great deal of power over the nation, and can dictate terms. This is what Perkins is referring to as a realm, as well as he recognizes that it has been very successful. The United States has actually had the ability to use its financial power to get influence and also control over various other countries, as well as this has been a very effective approach.