For the first question: First Lady Eleanor Roosevelt, upon sighted the Iguazu Waterfalls felt pity or disappointment on the American Waterfalls named the Niagara. The first lady said, "Poor Niagara".
For the second question: The answer is UNESCO World Heritage. Situated in Misiones Province in the Northeastern tip of Argentina and adjoining the Brazilian state of Parana to the north, Iguazú National Park is one of the world’s visually and acoustically most spectacular natural places for its huge waterfalls. It was one of the World Heritage List in 1984.