In general, disease is easier to spread in an agrarian society. This is many due to the fact that many of the same products go into harvesting crops, which, if they become contaminated, can spread through the community.
What did president roosevelt do to aid panama in becoming an independent country? a. he negotiated a peace treaty with nicaragua to purchase the land. b. he invaded colombia to establish a us base for defense. c. he placed warships around panama to block sea lanes. d. he used dollar diplomacy to block imports to nicaragua.