Final answer:
FDR's use of 'we' and 'us' in his inaugural address creates a sense of unity and teamwork, engaging all Americans in the collective effort to overcome the Great Depression.
Step-by-step explanation:
The effect of Franklin D. Roosevelt's use of "we" and "us" in his first inaugural address is to inspire a sense of unity and teamwork among Americans. By speaking inclusively, Roosevelt was not presenting himself as separate from the American people, but as part of a collective effort to face the challenges of the Great Depression. This rhetorical choice reinforced the idea that every citizen was involved in the recovery effort and played a role in ensuring the nation's success. It was a strategy to build support and galvanize the public, promoting a spirit of community during a time when national morale was low due to the economic crisis.