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History Dissertation Ideas - Which one should I do?

I'm in my 2nd year and I am trying to think of a dissertation topic, I have a variation of ideas, some really vague and others very specific but I don't know what will be the best option. These are some of my ideas:

1) Theatre during the English Civil War - did the theater go underground? Did the actors try and raise royalitst support in London?

2) The Cleaveland Street Scandal 1888 - the cat and mouse game - how did the brothels avoid persecution and how did the police find them?

3) The Journey to a New Life - European Revolutionaries living in London (or Cambridge)

4) The Morroccan Pirates - how did the African slave traders shape Europes view of Africa? (Inspired by James Milton's book on the two slave trades).

Those are my ideas but I don't know which one to choose and how far to narrow them down. Can someone perhaps give me an example of a dissertation question?

Thank you :smile: