Answer: the rebuilding of the Great Wall
At that time, the Chinese citizens had to face constant threats from the barbarian that resided on the northern part of their territory.The previously built wall was not strong enough and able to be destroyed by the invaders. Ming Dynasty took the credit of rebuilding and strengthening the structure of the great wall.
While living in New York, Riis experienced poverty and became a police reporter writing about the quality of life in the slums. He attempted to alleviate the bad living conditions of poor people by exposing their living conditions to the middle and upper classes. since he was an immigrant it probably put him into the same shoes as these images, without even having to empathize. its human nature to want better for yourself, and your family and friends, so this is what he hopes to do, and it worked, he sparked a progressive era for the "slums".
In germany it was called Wandel durch Annäherung
They Made a contract called Grundlagenvertrag
I believe they were being stripped off even more land?
