How did the incas unite the andes mountains?

The Inca Empire developed in the Andes Mountains of South America. The Incas had originally settled in a valley of the Andes Mountains around 1100. By 1400, the Inca began extending their rule across the Andes. ... The Incas built roads stretching over ten thousand miles to unite their vast empire.

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.