Did the Chinese Discover America?

According to menzies the chinese arrived on America 71 years before Columbus. The remarkable commander was Zheng He. He was a servant of a duke, Yong Le. Zheng is described as "tall and powerful" the admiral Zheng's flagship was the largest ship, it has 150 meters in length and could carry 1000 passengers. Diferent to columbus ship the Santa Maria was only 25 meters. Chinese carried their own food because they distrusted foreing food, the ship carried bathtub full of earth in which they cultivated fruits and vegetables. According to menzies Nicolo da Conti brought the maps to venice in 1428. For that reason, the menzies's theories support that chinene came to america fist.