横向
1
Exchange of goods between peoples
5
Government ruled by a king or queen
6
Formal agreement between nations
7
Period of ten years
8
Advanced stage of human society
9
Deadly epidemic disease
10
Ancient Mesoamerican civilization
11
Payment made to show submission
纵向
2
Legislative body in ancient Rome
3
Large territory under one ruler
4
Legislative assembly of a country
12
Armed entry into another territory
13
Government elected by the people