Final answer:
Journalist Jacob Riis exposed poor living conditions in New York City slums and tenements, leading to new laws such as the New Park Commission of 1900, which allowed for city funds to purchase small parks in crowded neighborhoods.
Step-by-step explanation:
The correct answer is New Park Commission of 1900.
In his book How the Other Half Lives, journalist Jacob Riis exposed the poor living conditions in New York City slums and tenements. His work generated public support for change, leading to the creation of new laws.
One of these laws was the New Park Commission of 1900, which allowed city funds to be used to purchase small parks in crowded neighborhoods. These parks provided much-needed space for families to get fresh air and enjoy life in the city.