Some of the most significant events in RV history include the creation of the first RV in the 1920s, the introduction of the term "recreational vehicle" in the 1950s, and the expansion of the highway system in the United States in the 1960s and 1970s, which made it easier for people to travel long distances in RVs. Other significant events in RV history include the development of new technologies and features, such as slide-out rooms and solar panels, and the growth of the RV industry as a whole.