Attacks from barbarian tribes outside of the empire such as the Visigoths, Huns, Franks, and Vandals. The Roman army was no longer a dominant force. The empire became so large it was difficult to govern.
Because Village green is a very common open area within the village or other settlement
Many schools, yards, churches , and other public property were built within the area
hope this helps
To be surrounded by positive energy and be a part of something bigger than themselves.