Across
1
Sudden overthrow of a government
6
Military blockade of a fortified place
7
Exchange of goods between peoples
8
Person who travels to discover new lands
9
Ancient empire that conquered much of Europe
10
Payment made to show submission
Down
1
Uprising against authority
2
Union formed for mutual benefit
3
Person with no fixed home
4
Alloy of copper and tin used in early tools
5
Advanced stage of human society
11
Practice of establishing foreign colonies