Passage: From the middle of the 19th century onwards, trade, industry and tourism gained momentum. Nevertheless, until the middle of the 20th century, agriculture dominated the canton. Today a great number of small and middle-sized businesses dominate the economy. The largest employer is the airplane constructor Pilatus. The small and middle-sized businesses work in a wide range of areas. Many specialize in machine construction, medical equipment, international trade, optics and electronics.

Question: When did these sectors of the economy begin to grow?
19th century