<em>Hello there, and thank you for posting your question here on brainly.
What event caused World War 1?
<u>Answer:
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<u>The event that caused World War 1 to start was the assassination of Archduke Franz Ferdinand on June 18th, 1914. World War 1 started a month later.
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Hope this helped you!! ♥</em>
To transport troops and supplies
These people became wealthy mostly because of efficient trade between countries. Trading was an important factor back then, and your key word is COASTAL, meaning they are by a sea (aka trading routes). So the answer is trading between countries.
I think your answer would be A., since they thought it would be easy to win.
