Across
1
Advanced stage of human society
6
Armed conflict between nations
7
Ancient Mesoamerican civilization
8
Payment made to show submission
9
Medieval land-for-service system
10
Military conflict or fight
11
Exchange of goods between peoples
12
Ancient empire that conquered much of Europe
13
Sudden overthrow of a government
Down
2
Union formed for mutual benefit
3
Large territory under one ruler
4
Alloy of copper and tin used in early tools
5
Government elected by the people
7
Handwritten historical document