Across
1
Formal agreement between nations
5
Payment made to show submission
6
Fortified medieval residence
7
Person who buys and sells goods
10
Person owned as property
12
Alloy of copper and tin used in early tools
13
Ancient Mesoamerican civilization
Down
2
Collection of traditional stories
3
Ancient empire that conquered much of Europe
4
Union formed for mutual benefit
8
Exchange of goods between peoples
9
Advanced stage of human society
11
Movement of people to new areas