Why did economist john kenneth galbraith believe that america's postwar economy was a new phenomenon?

Arecent poll of 500 residents in a large town found that only 36% were in favor of a proposed referendum to build a new high school. find the margin of error for this poll if we want 95% confidence in our estimate of the percentage of residents in favor of this proposed referendum.

To your knowledge had the usa ever invaded canada after the war of 1812

What two emerging factors after the war of 1812 contributed to the development of sctionalism