There were four common stages of growth in the life of an empire. which of the following indicates the adult phase: leaders gather together to determine how they should expand. outside forces begin to pick off villages and land. artisans are well-provided for and impact their culture. a leader begins to conquer adjacent lands and absorb other smaller civilizations.

A leader begins to conquer adjacent lands and absorb other smaller civilizations.

Explanation:

The adult state in the life of an empire is characterized by stability and balance. This happens, when the empire is already formed, established, with a strong sense of defense and sovereignty, and with boundaries delimited.

In this moment of stability, it is necessary to conquer other peoples to add gains of conquests and to boost the economy, for that it is necessary that a leader begins to conquer adjacent lands and to absorb other smaller civilizations.

they could have a boston tea party.

d. japan's attack on pearl harbor