The correct answer is An era of nationalism and economic growth
After the war of 1812 Americans felt proud of their country and a strong sense of belonging. Also during the war, the British government cut America’s access to manufactured goods and this forced America to somehow gain strength and produce those products internally what made the country gain economic independence.
They would support it because mussolinist is a very important role for business workers like them and if business workers don't have that kind of information they wouldn't be able to have their job.