Across
1
Advanced stage of human society
6
Ancient Mesoamerican civilization
8
Government elected by the people
9
Relating to the Middle Ages
10
Fundamental law of a nation
12
Exchange of goods between peoples
13
Territory controlled by another country
14
Payment made to show submission
15
Large territory under one ruler
Down
2
Medieval land-for-service system
3
Government by the people
4
Military blockade of a fortified place
5
Long and distinct period of history
7
Freedom from outside control
11
Armed conflict between nations