横向
1
Union formed for mutual benefit
6
Long and distinct period of history
7
Movement of people to new areas
8
Exchange of goods between peoples
9
Ancient Mesoamerican civilization
10
Practice of establishing foreign colonies
13
Medieval land-for-service system
14
Person owned as property
纵向
2
Government by the people
3
Sudden overthrow of a government
4
Period of one hundred years
5
Practice of farming and growing food
11
Fortified medieval residence
12
Legislative body in ancient Rome