Answer:
Railroads improved the movement of people from one area to the other
Observation balloons gathered information about the enemy and communicated it back to the officers
Explanation:
i took the test.
In 1821, William Becknell led a wagon train from Independence, Missouri, to Santa Fe, New Mexico. The wagon train led by William Becknell then established a <span> route for international trade with Mexico.</span>
Walls Had Protection From Armies