What are the most popular jobs in the 20th century?

In the 20th century, some of the most popular jobs included positions in manufacturing, such as factory workers and assembly line operators, driven by industrialization. Service sector jobs also grew significantly, with roles in retail, healthcare, and education becoming increasingly common. Additionally, professions like teachers, engineers, and office workers gained prominence as economies evolved. The rise of technology towards the century's end also introduced new roles in computing and information technology.