1. The practical answer would be Christopher Columbus, but this depends on your viewpoint. Other than Native Americans, which is another answer many believe, Leif Erikson and his group of Icelandic Explorers were known to have discovered American about 500 years before Columbus did.
2. The War of 1812 began on June 18, 1812. But there is debate on whether it ended Feburary 17th or 18th of 1812. According to these answer choices, however, it would be the latter
3. Karl Benz invented the automobile, as stated in the question. Contrary to the common belief that it was invented by Henry Ford. Henry Ford created the moving assembly line, which helped the manufacturing of cars quicker and easier.