Four of those inventions were, The hot air balloon, the light bulb, mayonnaise and the piano. (: Hope this helps!
To make trade and banking easier. But also because coins have been used as means of control and propaganda since this very invention , Kaiser William I appeared in the coins.
The rights and the privileges of freedmen were still threatened after the civil war because laws were still made to regulate their activities. The black codes law were enacted which controlled the way a freed man can live; strict restrictions were placed on them, they can not vote, serve on jury, travel freely or engage in occupation of their choice.
