Across
1
Advanced stage of human society
4
Ancient Mesoamerican civilization
5
Period of ten years
7
Person owned as property
9
Territory controlled by another country
12
Fortified medieval residence
Down
2
Union formed for mutual benefit
3
Succession of rulers from same family
6
Sudden overthrow of a government
8
Legislative body in ancient Rome
10
Metal that replaced bronze in tools
11
Deadly epidemic disease