 <translate> To answer the above question, the relevant sentence is: The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771 -- 476 BC) and Warring States periods (475 -- 221 BC) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221 -- 206 BC) against incursions by nomads from Inner Asia. The answer is 771 -- 476 BC. <yor> Lati dahun ibeere ti o wa loke, gbolohun ti o yẹ ni: Itan-akọọlẹ ti Odi Nla ti China bẹrẹ nigbati awọn odi ti o kọ nipasẹ awọn ipinlẹ oriṣiriṣi lakoko Igba Irẹdanu Ewe ati Igba Irẹdanu Ewe (771 - 476 BC) ati Awọn akoko Awọn ipinlẹ Ogun (475 - 221 BC) ni asopọ nipasẹ olori akọkọ ti China, Qin Shi Huang, lati daabobo ile-ọba Qin tuntun rẹ ti o da (221 - 206 BC) lodi si awọn ikọlu nipasẹ awọn arinrin ajo lati Inu Asia. Ìdáhùn náà ni 771 - 476 Ṣáájú Sànmánì Kristẹni. 