This image is an illustration of the Horseshoe Falls section of Niagara Falls, which is predominantly in Canada in this illustration. The extreme left side of the falls is in the United States.
The description states:
NIAGARA FALLS BY ILLUMINATION
This new enhancement of America’s beauty resources is nothing more than the Falls, under flood lighting for four hours each night. Their own power has been taken from them, brought under the control of man, and then turned back upon the power creator itself, and we get a new beauty, ten-fold greater than any beauty known at the Falls before man took hold to conquer them for service.
–Between 1955 and the mid-1980s, the extreme left side of Horseshoe Falls, which flowed around Terrapin Rocks, was blocked by an extension of land from Goat Island, creating Terrapin Point, Further reinforcement of the point and diversions blocked all of the Horseshoe Falls section in the United States, and about 100 meters of falls in Canada. Thus, the section that is colored orange at the left is no longer active.
This image likely dates from the 1930s.