横向
1
Metal that replaced bronze in tools
4
Military blockade of a fortified place
5
Succession of rulers from same family
6
Ancient Mesoamerican civilization
9
Belonging to a very old period
12
Union formed for mutual benefit
纵向
2
Period of one hundred years
3
Practice of establishing foreign colonies
7
Formal agreement between nations
8
Government ruled by a king or queen
10
Person with no fixed home
11
Long and distinct period of history
13
Period of ten years