"Grunewald's first great subject in his adopted country was the sublime Niagara Falls . . . As a natural phenomenon embodying metaphorically the aspirations of the nation, Niagara Falls was surely the most compelling magnet to artists and writers in North America. Niagara was to be a motif that occupied Grunewald frequently in the 1830s and 1840s."
From: Blume, Peter F. "Gustav Grunewald 1805–1878." Allentown Art Museum Publication, 1992. Page 8.