Answer:
Decline in trade - shift to a rural society
Explanation:
The fall of the Roman Empire brought significant changes in the mode of rule and governance. After the fall, the empire was governed by the warrior kings. The traditional and community guidelines were given priority than the written laws. There was a drastic change in the economic stability of the empire as well. The economy inclined towards the agricultural sector as the result of the collapse of the trade. It was because of the decline in the trade that shifted the empire towards the rural society.
<span>u.s. entry into WWI caused industrial psychologists to begin working with the military.After entering into world war-I there is a need for U.S to train their military and develop the army's strength and capability.Psychological research and treatment are important to national defense. Research can show how to improve military training, job assignment and equipment design. Treatment can help personnel cope with stress. Psychologists conduct research on human behavior and treat patients with mental problems. so,industrial psychologists to begin working with the military.</span>
