Take a look at this periodic table. It shows the nationalities of the discoverers of the various elements. First find out when a section was discovered and then come up with reasons why you these countries made these discoveries and not other countries around the world. In other words, from the standpoint of what was historically happening at the time, why did these countries make these discoveries. It might be best if you just looked at a single group.
This blog is for you...
Feel free to share some curious train of thought you have, as well as share your thoughts on others.