How does the parallel structure of these sentences help Roosevelt achieve his purpose?

How does the parallel structure of these sentences help Roosevelt achieve his purpose?

Read the excerpt from Roosevelt’s State of the Union address.

Fortunately, there are only a few Americans who place appetite above patriotism. The overwhelming majority realize that the food we send abroad is for essential military purposes, for our own and Allied fighting forces, and for necessary help in areas that we occupy.

How does the parallel structure of these sentences help Roosevelt achieve his purpose?

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