The main point of the 13th Amendment was to abolish slavery. With the 14 and 15th amendments it also established equal rights for Black Americans and their right to vote as well.
Okay, well a plow is used for farming. Basically the Sumerian plow is like a modern day tractor. If you have ever heard the term, "to plow the fields", you would know and immediately think of a tractor.
The answer to the question is b
B. The frustration of debtors and the failure of the articles of confederation.