The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
<span>On September 11, 1777 British General William Howe's army defeated George Washington's army defending Philadelphia at the Battle of Brandywine. Washington and his army were forced to retreat, there was no longer an American army defending Philadelphia. The British marched in and occupied Philadelphia...until the fortunes of war changed and the British left Philadelphia in June, 1778 without a fight.</span>
I think the answer is Ottoman Sultan Mehmed II
There are many moral standings and ideals that existed in the last that are completely at odds with what we think today. Or there were ideas on face and science that are just completely strange in comparison with today's ideas. Primary resources don't show a complete picture, because there are always gaps that need to be filled along the way. For example, a lot of primary sources and writing for Viking cultures were written by Christian writers, so it doesn't offered a clear perspective on the pagan side.