Did Trump win due to luck? Why?

No. You can't win something by luck if you're picked after being surveyed. Trump was the better candidate between him and Hillary. I'm not saying this out of bias, I'm saying this because he got the vote that made him win. CNN and other medias had many "Why Trump Will Lose" segments, but he was never really close to losing. They just never acknowledged that, while Trump has flaws, Hillary has more. Most people thought that just because she's a woman, she should win. Hillary thought so herself. She didn't really bring much to the table.