Final answer:
The U.S. government passed laws and loaned money to help solve the problems of the cities in the late 19th century.
Step-by-step explanation:
The U.S. government took a number of actions to help solve the problems of the cities in the late 19th century. One major action was the passing of laws. These laws addressed issues such as overcrowding, sanitation, and labor conditions. For example, the government passed laws regulating housing standards, establishing building codes, and improving working conditions. Another action taken by the government was to loan money. The government provided loans to fund public projects, such as the construction of parks, schools, and infrastructure, which helped improve the overall quality of life in the cities.