What was the holocaust?

-the killing of allied forces

-the systematic murder of about 11 million people which included 6 million people to jewish decent

-the name of the location where the last battle of world war 2 was fought

-the imprisonment of all people adolf hitler believed to be inferior

The genocide of the European Jews. so your second sentence is correct

The farmers on the Plains substituted red wheat for crops that depended on water like corn and watermelon. ... The tough, root-filled sod broke plows of many farmers. John Deere also invented more farming machines that eventually turned manualfarming into mechanical farming.