A study published in the journal of the american medical association showed that postal workers who tested positive for drug use in a pre-employment urine test were at least 50 percent more likely to be

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.