Answer:
The gold-salt trade in Africa made Ghana a powerful empire because they controlled the trade routes and taxed traders. Control of gold-salt trade routes helped Ghana, Mali, and Songhai to become large and powerful West African kingdoms.
The death of Archduke Franz Ferdinand and is wife that were with an alliance with France, Britain, Ireland and Russia called the Triple Entente was said to have widely acknowledged too have started WW1.
After the Japanese attack on Pearl Harbor, the Americans prepared for war. But only just that they prepared with war with Japan, but with its diaspora as well. Despite being not a single evidence that the Americans of Japanese descent collaborate with Japan, the Americans decided to secure their homeland and prevent such a thing before it had happened. Thousands of Japanese Americans were forcefully taken from their homes and they were put in concentration camps specially formed for them. It was a cruel and unnecessary move from the US officials, as the Japanese Americans were loyal to the US, not Japan, but the fear did its thing and irrationality prevailed in those moments.