This is my best guess on these plz do not quote me :)
14) T
15) T
16) F
17) F
18) T
19) F
20) T
One cause was the sheer size of the Mongol empire, due to its size the generals and grandsons of Genghis Khan (the most known Mongol warlord of all time) could not hold it together.
Another cause was that an empire of this size needed more and more administration which was not being done to the level it needed to be, and this eventually led to the decline as well.
Its the second one it have nothing to do with what they are asking
New York City, United States have a total of 5 districts called boroughs.
The boroughs of New York City are the following:
Manhattan, Brooklyn, Queens, The Bronx and, Staten Island.
Although these 5 boroughs are part of New York City, Manhattan is considered the main borough.