Rivers have always played an important role because they gave a windows of opportunity for a civilization to build and expand its influence and power through trading and just having a source of life near to it; namely a big river.
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In the constitution, you can found congressional powers regarding dealings with foreign relations in : C. Expressed
Expressed power refer to the power that is written in the constitution. You can find the written statement about this power in Article 1 of the United states Constitution
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Politician like William M. Tweed, more known as Boss Tweed, was similar to industrial magnate like Carnegie and Rockefeller because he, like Carnegie and Rockefeller, had a lot of control over different things. He was an advisor at the gas companies and various banks, he was a director of the Erie Railroads so all of these possesions directly linked him to events happening in the country - U.S. economy and government related events.
To secure him so anything happens to the president