The Answers is:
Probably the most important single cause of Byzantine empire collapse was its recurrent debilitating civil war. Three of the worst periods of civil war and internal infighting took place during Byzantine empire decline
Using latin as a primary language
Simon Bolìvar was the president of Bolivia.
Bartlett point out that british force was unprepared for battle which may accur. on the other hand the another team armies were strongly prepared for battle and enough power to defence.