Deganwidah and Hiawatha joined together and went from tribe to tribe. They convinced each tribe about the importance of peace and unity. They convinced the five tribes to form the Indian confederation called the Iroquois League. When the Europeans arrived, the Iroquois were a strong nation.
Roosevelt used to host "Fireside chats" to talk to the American people about global/local issues or events that were happening. It was a way for people to become informed of news at a much faster rate than with regular newspapers and such, it was a more effective news delivery system.
Byzantine Empire. They were Islamic too I believe.
I'm thinking of D but at the same time, A... But, I recommend D overall