They develop by conquering the lands of weaker kingdom and exploiting their resources.
Another method is by marrying their children to the children of another kingdom and unite their power
hope this helps
The total force (a) is the combination of active and reserve components service chiefs provide, and combatant commanders effectively use to full capability.
In the United States, the total force also comprises the civilian personnel as well as the contractors working for the Department of Defense. This represents about 3 million people. The management of this staff is under the responsibility of the Assistant Secretary of Defense for Manpower and Reserve Affairs.
They interract with one another when they're bartering goods.
Hunter/gatherers usually contribute a lot of wild animals and plants from the forest, sedentary farmers usually contribute a more domesticated form of plants products, while the pastoralists usually contribute sheep fur and various forms of dairy products.
