Across
1
Metal that replaced bronze in tools
3
Medieval religious military campaign
6
Payment made to show submission
8
Union formed for mutual benefit
9
Government ruled by a king or queen
10
Period of one hundred years
11
Deadly epidemic disease
13
Armed conflict between nations
14
Movement of people to new areas
Down
2
Government elected by the people
4
Alloy of copper and tin used in early tools
5
Government by the people
7
Formal agreement between nations
12
Legislative assembly of a country
15
Object made by humans from the past