1. Vietnam
2. Laos
3. Cambodia
4. Tonkin
5. Annam
It's important to note that Tonkin and Annam were actually parts of Vietnam, which was divided into three regions:
* Tonkin (North Vietnam)
* Annam (Central Vietnam)
* Cochinchina (South Vietnam)
So, the five territories can be simplified to:
1. Vietnam
2. Laos
3. Cambodia
French Indochina was a colonial territory of France from the late 19th century until its dissolution in the mid-20th century.