jeff By marinakerekes Period: 130 to 1450 Silk Road Period: 601 to 699 Crop Rotation Period: 1315 to 1322 Great Famine Period: 1401 to 1600 Age of Iron in West Africa 1499 Maritime Route Between Europe and India 1834 New Farm Equipment (Mechanical Reaper and Combine) 1970 Green Revolution 1994 GMOs Introduced