Silence = death is the answer
The tremendous changes that industrialism and urbanization brought triggered a debate over how best to address society's problems. Some Americans embraced the ideas of individualism and Social Darwinism.
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If plants in the rainforest and desert were able to share what they each have in abundance, rainforests would be less lush and deserts greener. Plants in the rainforest compete to reach the sun with broad leaves and tall stems, while desert plants evolved to store water. Most rainforests receive more than 100 inches of rain annually, while deserts barely collect 10 inches of precipitation a year in a good year, with periods of droughts frequently occurring. These drastic differences caused the plants within these two biomes to develop and adapt to their distinctive living conditions in different ways to help them thrive.
They usually traded these for slaves which were captured and sold to them.