Three of the following contributed to the end of the pax romana (3rd century
a. d. ). which one did not? a 20-year plague weakened the roman army and demoralized the civilian population. barbarian invasions caused widespread destruction and loss of life in several roman provinces. the empire was divided into eastern and western halves by two rival emperors. frequent revolts by units of the roman army led to the murder of many roman emperors.

superior technology and improved medical knowledge to foster imperialism. quinine enabled europeans

to survive tropical diseases and venture into the mosquito-infested interiors of africa and asia. the combination

of the steamboat and the telegraph enabled the western powers to increase their mobility and to quickly respond

to any situations that threatened their dominance. the rapid-fire machine gun also gave them a military advantage

and was in convincing africans and asians to accept western control. the following table summarizes the

causes of the new imperialism:

causes of new imperialism

economic military/political humanitarian/religious technological

need for markets need for military bases white man’s burden new medicine

raw materials national security spread of christianity new weapons

source of investments source of

pride—nationalism

social darwinism

(superiority of western

society)

transportation

i