What year was cross curricular teaching or teaching through topic first introduced?

Cross-curricular teaching, also known as integrated or thematic teaching, has roots that can be traced back to the early 20th century, particularly in the 1920s and 1930s. However, it gained significant prominence in educational theory and practice during the 1960s and 1970s, influenced by progressive education movements that emphasized holistic learning and real-world connections. The approach continues to evolve, adapting to contemporary educational needs and curricula.