The one that declared that slavery was necessary was John C. Calhoun.
He was a US South Senator.
He was a political leader. He was a congressman, a secretary of war, a vice president, a senator, and a secretary of state. He believed that slavery was a symbol of the south and that it was something possitive.
Answer: William Becknell and General Thomas James
Introduction:
By September, 1821, the Revolution in Mexico against the Spanish rule had succeeded,<em> Mexico was a free country</em> and could trade with whomever they pleased and<em> Americans</em> were now welcome in<em> New Mexico. </em>
Explanation:
The <em>William Becknell</em> party arrived in Santa Fe followed by the<em> General Thomas James / John McKnight </em>expedition, <em>only two weeks after. </em>
William Becknell escaped the financial depression Missouri was facing, he saw Santa Fe as a new opportunity to trade his goods. Becknell followed a new route in 1822 and became famous as the Santa Fe Trail.
General Thomas James arrived to Santa Fe with John McKnight in an expedition that served two purposes, General Thomas James's purpose was to trade with the Indians while John McKnight was looking for his brother Robert McKnight who had been held prisoner by the Spanish.
The correct answer to this open question is the following.
Since the beginning of the Islamic era in 622, the diffusion of Muslim advancement in science, technology, or mathematics spread basically through trade and conquest. As Muslims conquered territories, they established trade routes and spread the Muslim's teachings to the conquered regions, although they allowed people to have their own belief systems.
So since medial times, Muslims shared their knowledge and inventions in the fields of astronomy, mathematics, algebra, cartography, geography, cosmology, alchemy, astronomy, opthalmology, chemistry, botany, agronomy, medicine, pharmacology, and the development of trade in the harsh conditions of the desert.
It affected their social lives, and there was very little trade between the two regions (the only ones around.) They also needed many people. They developed irrigation and drainage systems which caused many people to work.