<u>Answer:</u>
According to How the Other Half Lives, the one reason which makes it dangerous to live in buildings in city slums D: Buildings were very dark.
<u>Explanation:</u>
Jacob Riis was a police reporter and a social reformer. His book version of “How the other half lives” was published and highlighted the plight of the people living in tenement apartments. Immigrants who had just come to United states for a better life lived in these tenements. The living conditions were pathetic. Buildings were overcrowded, poorly ventilated and quite dark. They did not even have proper sanitation, so pests and bugs were a common problem there.  There were children working in factories or were newsboys or garment workers.  
 
        
             
        
        
        
I believe that the answer to the question provided above is because of industrial revolution US shipping industry flourish in the late 1700's
Hope my answer would be a great help for you.    If you have more questions feel free to ask here at Brainly.
 
        
             
        
        
        
The primary aim of the United Nations<span> Security Council is to prevent violent conflicts between </span>nations. In essence, they are responsible for global peace and security. Describe the motivating factors for the creation of the United Nations in 1945<span>.
Hope this helps!</span>
        
                    
             
        
        
        
First, it allowed for businesses to find new ways to do old tasks and do them more efficiently. It also developed communication and transportation, making it easier for businesses to reach their consumers. By creating new jobs and getting more workers into the American work force, technology helped add to the already expanding American economy. Business leaders known as "robber barons" and "captains of industry" were harnessing this newly emerging technology and using it in their businesses. The Gilded Age was a time where there was great changes and developments in technology
 
        
             
        
        
        
Wave after wave of Germanic barbarian tribes swept through the Roman Empire. ... Romulus, the last of the Roman emperors in the west, was overthrown by the Germanic leader Odoacer, who became the first Barbarian to rule in Rome. The order that the Roman Empire had brought to western Europe for 1000 years was no more.