Who is the subject of this text?
"for 30 years, he crisscrossed africa. he wrote about the many peoples he met with more sympathy and less bias than did most europeans. he relentlessly opposed the slave trade, which remained a profitable business for some african rulers and foreign traders. the only way to end this cruel traffic, he believed, was to open up the interior of africa to christianity and trade."

The answer is David Livingstone

Explanation:

David Livingstone was a British explorer and missioner who was famous for his discoverers in the African continent, especially the Kalahari Desert and the Lake Ngami in the 1840s. As a missioner, his contacts with the natives were friendly because Livingstone tried to be tender and respectful with the Africans, which gave him the possibility to spread Christianity with no resistance.

true

explanation:

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.