Which of the following improved travel in 1807?
the national road
the steamboat
the steam locomotive
the transcontinental railroad

The steamboat

Explanation:

Robert Fulton collaborated with Robert Livingston in 1807 to build the North River Steamboat. This boat, which later acquired the colloquial name Clermont, became the first ship to show the feasibility of using steam propulsion in commercial water transport. This was something revolutionary that greatly improved and expedited the trips made in 1807.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.