When American settlers first arrived in Texas in 1821, they were not allowed to bring or trade enslaved people.
they were allowed to bring and trade enslaved people.
they were allowed to bring, but not trade, enslaved people.
they were allowed to trade, but not import, enslaved people.

They were encouraged to bring slaves. For every slave brought to Texas in 1821 you would receive 80 acres of land. so I would say number 2 is your best bet.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.