The term for an end state of expansion is "equilibrium". This refers to a state of balance or stability that is reached after a period of growth or expansion.
Equilibrium is achieved when all forces or factors within a system are balanced. This means that there is no net change or movement in the system, and it remains in a steady state.
In theory, equilibrium can be maintained indefinitely if there are no external influences or disturbances. However, in reality, most systems are constantly changing and therefore, equilibrium is often temporary.
When equilibrium is disrupted, the system will try to adjust and return to a state of balance. This can result in changes or shifts in the system, as it tries to adapt to the new conditions.
Equilibrium is not always desirable, as it can also signify a lack of growth or progress. In some cases, a system may need to be in a state of imbalance in order to continue evolving or improving.