Why did many Southerners feel betrayed by President Zachary Taylor?

because he was a Southerner who favored California's admission as a free state.

there was multiple reasons but the one i really remember is he (as a southerner) supported California joining as a free state

question as stated in comment

why did the chinese require the portuguese to pay for goods in gold and silver when trading?

choices

portuguese goods were less valuable than chinese goods.

the chinese already had a surplus of portuguese goods.

the imperial government wanted to stockpile gold and silver.

portuguese and chinese currencies were not exchangeable.

this a history q n in ancient time, theres no money exchange. so ans is portuguese and chinese currencies were not exchangeable.