What did Jacob riis book how the other half lives show?

It shows how poorly the immigrants lived in the tenements

Explanation:It basically shows how poor the other half was living in poverty and poor conditions with little to no government help. His pictures and photographs in his book were all over the world and people knew the struggle the “other half” aka immigrant lived cooped up in a small apartment with unsanitary conditions and unhealthy conditions.

The poor living conditions of people in tenements

Explanation:

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.