Across
1
Exchange of goods between peoples
3
Territory controlled by another country
4
Union formed for mutual benefit
7
Alloy of copper and tin used in early tools
8
Period of ten years
12
Movement of people to new areas
Down
2
Person who travels to discover new lands
5
Freedom from outside control
6
Handwritten historical document
9
Metal that replaced bronze in tools
10
Government elected by the people
11
Succession of rulers from same family
13
Long and distinct period of history