Bad things.
If Hitler had won the Battle of Britain, It would have been less likely for the US to get involved in the European war. Low chance but plausible for the Germans to have won the war.
Many historians believe that this is exactly what would have happened. Most believe that Hitler was, among other things, paranoid and an obvious control freak. If he had trusted his advisers/generals more, the Nazis would most likely be the major power in Europe today.
Hitler probably would have won WWII
Henry V of England won the Battle of Agincourt against the French during the Hundred Years War.
Stalin, of coarse. All he would have to do is order a massacre like Katyn.
Hitler would have won the war.
England won the World Cup.
England won the world cup.
England won the world cup!
He won lots of land.
If Napoleon had won then France would have continued to be the greatest power in Europe, and would not have been eclipsed by England: France would have become a large and wealthy country that dominated Europe. The 'what ifs' would go on forever about what MIGHT have happened or what COULD have happened if this HAD happened but it didn't. The European Union would have formed much more earlier.
If England was in the war alone (without the U.S. and the USSR) she would have either come to terms with Hitler or eventually been defeated by Germany. If it was just England and the USSR then Germany probably would have been defeated by the USSR with a little help from British Bomber Command and that's about it.
Hitler would not have committed suicide
England won the world cup
England won the football world cup.
Well, the Nazi's would have been a bit lost for a bit but probably someone else would have taken charge and if they were better then they could have won the war!
If Hitler had won the Battle of Britain, It would have been less likely for the US to get involved in the European war. Low chance but plausible for the Germans to have won the war.