Former President Donald Trump faced backlash after downplaying the significance of the Civil War and claiming that he has been treated worse than any other president in American history during a rally in Las Vegas, RadarOnline.com has learned. While addressing his supporters, the Republican frontrunner sarcastically remarked, “People say, how do you do it, sir? How do you do it? If you had it to do again, would you do it? Because, you know, in history, they say the president that was treated the worst was Abraham Lincoln. But he had the Civil War, you know. So he had a little Civil War going, …