The rapid growth of california during the gold rush made the demand for an urgent one.
a. a transcontinental railroad
b. a transcontinental canal system
c. an interstate highway
d. an additional oregon trail

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare