Someone who is indentured is essentially a slave, but they are working to pay off a debt they have with their owner or boss. Indentured workers have more rights in later years, and will most likely pay off their debts and be free.
The eastern and western roman empire.
It effectively overturned a Florida law demanding a recount which ended up Bush winning.
They have the ability to kill billions of people with one atom bomb instead of one person at a time with a flintlock pistol