The country which has Niagara Fallson its northern border is the d) United States with Canada. It specifically is the border with the Canadian province of Ontario and the state of New York. There are three waterfalls named the Horseshoe Falls, the American Falls and the Bridal Veil Falls.
D is the answer i believe
The Congress of Vienna was considered a success because it was the first time in history that on a continental scale national representatives came together to formulate treaties, instead of relying mostly on messages from the several capitals. The Congress of Vienna was a conference headed by the monarchs of Austria and it was to provide a long-term peace plan for the superpowers of Europe and to have stability in Europe.
