How did the gadsden purchase benefit travel in the united states?

it provided a water route to the west.
it held a mountain pass to the west.
it was the last territory disputed and policed by mexican soldiers.
it would encourage investment by northern industrialists for trade.

What was zheng he’s most important accomplishment? zheng he spread chinese ideas and brought wealth to china from his travels. zheng he commanded an impressive fleet of ships. zheng he sailed the indian ocean and around africa. zheng he conquered lands as far away as africa to increase the dynasty’s power.