USA HISTORY

Detailed explanation-1: -The Inca Empire built a huge civilization in the Andes mountains of South America. Some of their most impressive inventions were roads and bridges, including suspension bridges, which use thick cables to hold up the walkway.

Detailed explanation-2: -The Inca’s greatest technological skill was engineering. The best example is their amazing system of roads. The Incas built roads across the length of and width of their empire. To create routes through steep mountain ranges, they carved staircases and gouged tunnels out of rock.

Detailed explanation-3: -The Inca road system formed a network known as the royal highway or qhapaq ñan, which became an invaluable part of the Inca empire. Roads facilitated the movement of armies, people, and goods across plains, deserts and mountains.

Detailed explanation-4: -The Inca built nearly 15, 000 mi (24, 140 km) of roads. Nearly onequarter of this total was made up of two primary roads that ran the length of the empire, one along the crest of the Andes and the other along the coast.

Detailed explanation-5: -The Incas built causeways to elevate the roads in swampy areas. They also built amazing bridges, which they called chacas. The hanging bridges are the most famous of the Incan chacas. One Incan bridge was over 250 feet long.