What was an improvement in transportation during the early 1900s ?

The early 1900s periods was also responsible for the popularization of the mass transit systems, an aspect that led to rapid growth as well as cheap, easy, and flexible movement. This period also marked the emergence and popularization of automobiles later towards the second decade of the 20th century.

The launch of the electric streetcars, buses, subway, and the commuter and elevated rails among other modes of mass transit of the early 1900s period was a major development in the history of American transportation and its gradual evolution. The electric streetcar, during this period, became the most preferred mode of mass transit.

What are they! i have no idea lol