expansionist

Maybe advanced civilizations need to learn to rein in their expansionist instincts to survive.

And under the pressure of this three-part attack, the, you know, this expansionist what had become more imperial state buckles.

We know that humans are curious, competitive, greedy for resources, and expansionist.

If they are still curious, competitive, greedy and expansionist, and now have complete control over their home system, stellar infrastructure in place, and the energy output of a star, the next frontier moves to other stars light years away.