What were the main causes to the dust bowl

One of the most significant problems facing governments with low gdp is that a low gdp often results in

Germany raced to build the largest navy.

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.