Which claim from the article is least supported?
"New York didn't seem to need the river anymore, except as a sewer. And that's what it became."
(paragraph 2)
"Industry on the river had made some New Yorkers filthy rich." (paragraph 3)
"But it had just made the river filthy." (paragraph 3)
"But now there were other dreamers in the valley, with their own dreams of wealth." (paragraph 6)