Final answer:
Mass tourism began in earnest in the 20th century, catalyzed by economic growth post-World War II, advancements in transportation, and societal changes. Key historical markers include the Federal Highway Act of 1921 in the U.S.
Step-by-step explanation:
The phenomenon of mass tourism can be traced back to the 19th century with the advent of organized travel experiences such as the Grand Tour which was popularized by tour guides like Thomas Cook. However, it wasn't until the twentieth century that tourism began to emerge as a significant global industry.
Post-World War II economic growth, technological advancements in transportation, and societal changes facilitated a massive increase in tourism activities. Notably, the Federal Highway Act of 1921 marked a significant change in the United States by encouraging national highway construction, which led to roadside attractions and a new style of American travel.
In regions like Europe and Latin America, the increase in tourist activity contributed significantly to economic growth. Places like Spain France and later Australia leveraged their natural and cultural assets to attract a global audience.
By the mid-to-late 20th century, developments in infrastructure and a growing middle class further accelerated the tourism trend, culminating in tourism becoming a major economic sector for numerous countries.
It was during the 20th century that the foundations for modern mass tourism were laid, enabled by economics, technology, and social factors that made travel more accessible and desirable for large numbers of people from diverse socio-economic backgrounds.
As prices for travel dropped, and transportation modes improved, people began traveling more frequently and further afield, marking the solidifying presence of mass tourism in global culture and economy.