What permitted transportation in the early years of the united states

Pony Express

Explanation:

The Pony Express is the name by which was known a historical first express transport system put into operation in 1860, that carried correspondences to horse crossing wild territories of the United States of America.

The history of the Pony Express is exciting for the selflessness and effort of the men who rode horses practically always at a gallop, with the aim of traveling daily as many kilometers as possible.

In addition to the natural difficulties of the "roads" they had to travel, they might have to face bandits, hostile Indians, and even wild beasts that roamed the vast plains, provided only with essentials, so as not to cause much weight on the mount. Usually they carried a bag with mail, a revolver, a cantil with water, and sometimes an rifle.