Which of the following most directly led to the decline of the Byzantine Empire in the thirteenth century? * A. The expansion of the Umayyad and Abbasid caliphates
B. The expansion of the Mongol Empire
C. The collapse of trans-Saharan trade routes in Nothern and Western Africa.
D. The expansion of Crusading activities in the Mediterranean region

the tallest building in the western hemisphere and the sixth tallest building in the world

assessment is the missing word

hi there!

question - in the 1900s there were two competing views about the environment that often pitted industrialist and conservationist against one another. how were these two competing views demonstrated by the environmental policies of president roosevelt and president taft?

hope this : )