横向
1
Government by the people
5
Belonging to a very old period
7
Government ruled by a king or queen
8
Person owned as property
10
Metal that replaced bronze in tools
11
Person with no fixed home
纵向
2
Government elected by the people
3
Succession of rulers from same family
4
Advanced stage of human society
6
Ancient Mesoamerican civilization
9
Person who buys and sells goods