When you start typing a search query into Google, it gives you suggestions based on what other people are searching for. The following map shows the top suggestion for the question “Why did …?” for European countries, e.g. what comes up after “Why did Germany …”.
However, the suggestions differ from country to country. To generate the map, I used a VPN based in New York, so the results reflect what Americans search for. If you access Google from another country, you may get different suggestions.