TBH I think it goes back way further than that: US expansion started of as part of the British expansion, who were probably inspired by Romans. I'm sure there are examples further back in history as well. It's a pretty easy general idea to come up with if you are unburdened by ethics, empathy or humanity and your only motivation is greed and/or religious zealotry. But yes, parallels with Lebensraum specifically are especially potent.