In 1938 what did a group of social scientist call the nations number economic problemu. s history 

In 1938, a group of Franklin D. Roosevelt's social scientists stated that the nation's number one economic problem was "the South".

During this time, the country, as a whole was still fighting to escape the woes of the Great Depression. This fight was felt the sharpest in the South where economically it was still recovering from the effects of the Civil War loss and reconstruction after the loss of slavery.

the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .

because the vietnam war was fought in an especially brutal and untraditional way