横向
1
Union formed for mutual benefit
3
Ancient Mesoamerican civilization
5
Armed conflict between nations
7
Payment made to show submission
8
Person with no fixed home
9
Person owned as property
10
Person who travels to discover new lands
11
Person who buys and sells goods
13
Metal that replaced bronze in tools
纵向
2
Freedom from outside control
3
Movement of people to new areas
4
Alloy of copper and tin used in early tools
6
Territory controlled by another country
12
Period of ten years