Slave ships were large cargo ships specially converted for the purpose of transporting slaves. ... As many as 20 million Africans were transported by ship. The transportation of slaves from Africa to America was known as the Middle Passage.
The climate was an important cause<span> of the </span>dust bowl<span>. The climate of the Great Plain's region is dry and windy; winds reached the speed of 60 mph. Scientists believed that drought which </span>caused the dust bowl<span> to take place occurred because it happened same time as La Nina event in the Pacific Ocean.</span>
The early humans that arrived in the Americas were thought to have eradicated large ice age animals. However, research later revealed that the disappearance of such animals may have been caused by climate change. According to earliest dated artefacts, this may have happened more than 15000 years ago
