I think the author intention is wanting he readers to have a look of what’s life like during the times of war, and how in a flash of a second, all of it changed with a single bomb. The bomb’s destructive power was so strong and the author wanted to capture the essence of it and its surprise to the people.
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The text suggests that the cause behind the continued expansion of education in the early twentieth century is the efforts of the Progressive Movement that demanded reforms to the education system. This allowed the growth of educational institutions and the number of children that attended school in the United States.