What reason does senator calhoun argue slavery is good and necessary?

Calhoun said slavery was a "necessary evil" and "positive good" that helped slaves and owners.

'To protect minority rights against majority rule,' he called for a concurrent majority by which 'the minority could block some proposals that it felt infringed on their liberties.'

Explanation:

I hope this helps.

it allows shippers to carry commercial goods, which allows them to save time and money.