What american inventor put a steam engine on a ship for the first time

Thomas Newcomen

Explanation:

In the early 18th century, more specifically in 1712, an American inventor managed to create a steam engine for a ship. Newcomen was the inventor that came out with this revolutionary inventions for the marine travel. The goals of course was to make the boats and ships much quicker, to not depend on the weather conditions but on their own power, and the man power to be replaced with steam power. Even though the initial steam engine was far from perfect, it managed to inspire many other inventors in the years to come to develop much better and more practical steam engines for ships, which eventually improved significantly the marine transport and warfare.

b europeans take corn to africa. corn becomes an important crop there.