Which Nation Started The Most Wars?
Well, ask a question and get an answer. We have started a lot of wars, there is no denying that.
Which nation has caused more devastation/death would be a worthwhile question, but one will have a tricky time defining which participants are responsible for the devastation that occurs.
You might also ask what nation has initiated the most conflicts without good reason, but what constitutes a good reason is going to be highly contentious.