PLEASE HELP ASAP! I NEED HELP WITH THESE QUESTIONS 20 POINTS!

Were african-americans allowed to serve in the military in wwi?

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.