The first practical self-powered machine gun was invented in 1884 by Sir Hiram Maxim.
1836
Samuel Colt submitted a British patent for his revolver in 1835 and an American patent (number 138) on February 25, 1836 for a Revolving gun, and made the first production model on March 5 of that year. Another revolver patent was issued to Samuel Colt on August 29, 1839.
Yes they did. They must have thought that the conflict over slavery will be solved through this civil war. You have to do the other part thouugh it is what would YOU do.