Seminar portfolio: where to start?..
Any writing begins with a research on the topic and actually every research begins with googling) In your case, it is better to search using key words such as “weak states” and “why African states are classified as weak”.
Here are the best sources I have found and thus recommend to start with
Failed and Weak States in Theory and Practice – may be cited as a credible source but is basically for you to get a general idea about what a “weak state” means.
Failed States, Collapsed States, Weak States: Causes and Indicators – is a very good source giving a detailed overview of how experts classify states as strong or weak
STATE FAILURE IN AFRICA: CAUSES, CONSEQUENCES AND RESPONSES – deals specifically with African states and causes and consequences of their weakness
Rebuilding Weak States – the source explains why the US has strategic interests in supporting weak states that is what the weakness of the states means for the rest of the world, which I think will be also great to use in your report.
As you read all the sources, think of the structure of your paper/presentation. Be careful to assess how many words you can devote to this or that section. For example, if the report should be 900 word-long (3 pages) you may devote 150-200 to speaking about weak states in general before coming down to the consideration of Africa in particular.
Good luck with writing!
You are welcome to ask additional questions about the paper.