Ok, you may be writing about the Two-Thirds Compromise because your instructor told you to. But beyond that, find a way to consider why you (and we) expository hooks should care about it. What is important about your topic (whether historical or contemporary, out of the STEM fields or music and dance) here and now? Who are the stakeholders in your argument? Is there anyone whose voice hasn’t been heard on this that you could bring to light? In other words, “so what?” If you can find a legitimate reason why the argument matters, you can argue it from a stronger, more complicated place. A good introduction also needs to contain enough background information to allow the reader to understand the thesis statement and arguments. The amount of background information required will depend on the topic. There should be enough background information so you don't have to spend too much time with it in the body of the thesis, but not so much that it becomes uninteresting.