Answer:
Definitely the invention of mechanical tools, especially Cyrus McCormick's reaper.
Explanation:
https://www.farm-equipment.com/articles/4269-feature-articles---timeline-of-ag-equipment-firsts#:~:text=The%20era%20when%20farm%20equipment,the%20first%20stationary%20threshing%20machine.&text=But%20it%20was%20Cyrus%20McCormick's,equipment%20industry%20we%20know%20today.
This is a great timeline to view on the subject. :)
