横向
1
Sudden overthrow of a government
5
Formal agreement between nations
6
Exchange of goods between peoples
8
Territory controlled by another country
9
Ancient Mesoamerican civilization
10
Ancient empire that conquered much of Europe
11
Alloy of copper and tin used in early tools
纵向
2
Relating to the Middle Ages
3
Belonging to a very old period
4
Government elected by the people
7
Government ruled by a king or queen
12
Person who travels to discover new lands