Which best describes the development of farming in the united states by 1850?
it had become more productive and less difficult.
it had become less productive and more difficult.
it was centered exclusively in the south.
it was centered exclusively in the midwest.

It had become more productive and less difficult.

Farming in the US in the 1850's was found in the Midwest and in the South. The advancements in technology helped to make farming easier and produce more.

Technology such as McCormick's reaper and Deere's steel plow allowed farmers to seed and harvest more quickly and therefore they could farm more area. Irrigation systems and fertilizers was developed during the 1830's and 1840's as well. Irrigation created more fertile land and fertilizers also increased the fertility of the land and the production of crops.

d. japan's attack on pearl harbor

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.