Needs more synonyms. I tried "Austria-Hungary" and "Austro-Hungarian Empire" for number 1, and it didn't accept either of them. And it took me like five tries to figure out which spelling of "Pangea" you wanted.
Might want to change the one about the Ottoman Empire...it didn't break down before WW1, it ended in 1922/23, WW1 is one of the things that hastened its demise.