The arabs carried on extensive trade both by ? and by camel?

The Arabs carried extensive trade by both camel and boat in the Red Sea and Indian Ocean. Using these varying methods of transport meant they were able to build strong trade routes with a wide variety of countries, as using both camels and ships meant they were able to cover land and sea routes.

Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google