横向
1
Long and distinct period of history
3
Sudden overthrow of a government
4
Exchange of goods between peoples
5
Fundamental law of a nation
6
Ancient empire that conquered much of Europe
11
Government ruled by a king or queen
14
Movement of people to new areas
纵向
2
Freedom from outside control
7
Large territory under one ruler
8
Union formed for mutual benefit
9
Deadly epidemic disease
10
Military blockade of a fortified place
12
Payment made to show submission
13
Advanced stage of human society