I have just finished reading How to Hide an Empire by historian Daniel Immerwahr. It is an excellent book about the complex relationship of the US with the concept of empire and the great lengths it has gone to hide the fact that it is an imperial power. In the early part (p. 56-58) he recounts a poignant story. He tells it so well that to summarize and paraphrase it would be to do a disservice to the story so I give it below.
He sets it up by saying that industrialized agricultural practices had greatly depleted the soil and up to the beginning of the 20th century, the main sources of fertilizer to revive soils were natural sources that were mined from rocky islands in the Pacific ocean that were made of out of hardened bird droppings called guano.
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