How could the River Thames become so polluted so quickly?

Fifty years ago, the river was so polluted that it was declared biologically dead. In the 19th century people regularly contracted cholera from the water and died.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

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