Because the roman empire was so large
a.
it wasn’t easy to collect taxes.
b.
roman emperors often traveled to the provinces.
c.
diocletian divided it into three parts.
d.
it was hard to defend.

b.  Roman emperors often traveled to the provinces.

Explanation:

the alfred thayer mahan award for literary achievement is awarded each year by the navy league of the united states. the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation. presented since 1957, "this award for literary achievement is awarded to a u.s. navy officer, u.s. marine corps officer, enlisted service member, or civilian who has made a notable literary contribution that has advanced the knowledge of the importance of sea power in the united states."[1]

because the earth is a round globe. but that is just what they tell us it is flat and those dudes actually where lying they sailed east.