CBSE Class 9 Answered

There was a phenomenal increase in grain production of America. Vast chunks of lands in America were brought under cultivation. As prairies were covered with thick grass, it was difficult to plow the lands with simple ploughs. Thus, various technological innovations took place in order to clear lands. To clear grass, many new ploughs up to 12 feet long were devised. By the beginning of the twentieth century, farmers began to use tractors which helped them to clear lands for agriculture. In 1831, Cyrus McCormick invented the mechanical reaper. It could cut large crops in large quantities. Later, the use of combine harvesters, further, speeded up the process of grain harvesting. The use of these devices and machines resulted in production of crops on a large scale within a stipulated period of time.