Which theory states that countries need to grow by adding territory or risk losing it?

The Organic State Theory is the concept that compares nations to living organisms that must grow by acquiring more territory to survive and thrive. This theory suggests that just as organisms expand to meet their needs, nations must also extend their land to secure resources, population, and economic stability. The idea emphasizes that without growth, states may face decline or even existential threats, much like a living organism that could perish if it lacks necessary nutrients and space.

This perspective helps explain historical expansionist policies of countries that felt the need to acquire new territories in order to maintain their power and stability. The theory aligns well with various historical contexts where nations sought to expand for economic benefits, military advantages, and geopolitical strength, drawing parallels between the survival of a state and that of an organism in nature.