Across
1
Ancient empire that conquered much of Europe
2
Armed entry into another territory
3
Formal agreement between nations
4
Fundamental law of a nation
8
Advanced stage of human society
11
Legislative assembly of a country
12
Government elected by the people
Down
1
Sudden overthrow of a government
2
Metal that replaced bronze in tools
5
Person who buys and sells goods
6
Payment made to show submission
7
Territory controlled by another country
9
Long and distinct period of history
10
Military conflict or fight