I believe the answer is: Feedback
in communication, feedback refers to the response that we have after receiving a certain message. For the giver of the message,feedback could be used as some sort of confirmation to ensure that the receiver is not confused about the content of the message.
Answer:
1. Roman Invasion of Britain 2. Columbus reaches America 3. Victoria becomes Queen 4. First World War
Granting titles of nobility
Permitting slavery
Denying citizens the right to vote due to race (colour) or previous servitude
Denying citizens the right to vote due to gender <span />