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He describes tree trunks like pillars because they were most likely very big and magnificent to Roosevelt, comparing them to pillars of a cathedral specifically because they are typically well crafted and beautiful, so Roosevelt is praising and glorifying the trees.

This reveals that Roosevelt is amazed by nature and trees, and admires the grandiosity and impressiveness in the trees and how nature constructs itself.

Meeting these challenges would require massive government spending, conversion of existing industries to wartime production, construction of huge new factories, changes in consumption, and restrictions on many aspects of American life. Government, industry, and labor would need to cooperate.

Explanation: