These were expensive to build and maintain so they looked for better and cheaper ways to move goods and people? canals

roads

railroads

planes

the lachish letters were written by hoshaiah, a military officer stationed possibly in mareshah,   and sent to yaush, possibly the commanding officer at lachish.

the series of letters were written in carbon ink in ancient hebrew on clay ostraca, shortly before lachish fell to the babylonian army of king nebuchadnezzar in 588/6 bc during the reign of zedekiah, king of judah.

estoy bastante seguro de que la respuesta es una