Agricultural productivity in the Midwest increased in the late 1830s partly because of

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John Deere's steel plow was a significant innovation in agriculture in the Midwest in the late 1830s. The steel plow could break through the tough prairie soil, making it easier to till the land and leading to increased agricultural productivity. The invention of threshers and the influence of steam power on farming also contributed to increased productivity, but the impact of John Deere's steel plow was particularly significant. The option D about freed slaves is not relevant to the changes in agricultural productivity in the Midwest during the late 1830s.

Agricultural Productivity in the Midwest Increased in the Late 1830s