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By the time two new international treaties in early 1846 and early 1848[1] officially settled new western coastal territories in the United States and spurred a large upsurge in migration, the days of mountain men making a good living by fur trapping had largely ended. This was partly because the fur industry was failing due to reduced demand and over trapping. With the rise of the silk trade and quick collapse of the North American beaver-based fur trade in the later 1830s–1840s, many of the mountain men settled into jobs as Army Scouts or wagon train guides or settled throughout the lands which they had helped open up.
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<h3>Researchers also estimate global economic losses from fossil fuel air pollution at $2.9 trillion each year, or approximately 3.3 percent of global GDP. In the United States alone, air pollution from burning fossil fuels is linked to an estimated 230,000 deaths and $600 billion in economic losses annually.</h3>
<span>The states now faced serious and complicated questions about how to make their rules.</span>
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The drawbacks were that they could not get much wood from where the ancient egeyptians were so they had to trade their crops (grain) for wood.
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