Indian Ocean trade Madagascar at this time leaving behind a lasting cultural and genetic legacy. Chinese fleets under Zheng He criscrossed the Indian Ocean during the early part of the 15th century. The missions were diplomatic rather than commercial, but many exchanges of gift and produces were made. The Portuguese under Vasco da Gama discovered a naval route to the Indian Ocean through the southern tip of Africa in 1497–98. Initially, the Portuguese were mainly active in Calicut, but the northern region of Gujarat was even more important for trade, and an essential intermediary in east-west trade. Venetian interests were directly threatened as
Ocean to Ocean Bridge into position. The span was floated down river and swung into place carefully and methodically on March 3, 1915, followed by local praise and celebration. Following completion, the Ocean To Ocean Bridge was ceremoniously opened to the public on May 22, 1915. The bridge became a crucial link in the nationwide transcontinental Ocean-to-Ocean Highway and was also the first highway bridge across the lower Colorado River. On November 11, 1926, the bridge became part of U.S. Route 80. The successor to the earlier Ocean-to-Ocean Highway, US 80 became the primary east to west transcontinental highway in Arizona and between the