I think the answer is France. Because of the Ardennes Forest, Germany was not able to invade France from its east border. So Germany decided to attack Netherlands, Luxumbourg, Belgium, Norway, and Denmark. Hitler was able to go around the French border through the English Channel. He was able to defeat France with his strategy.
Ellis island was where thousands of immigrants were processed before being allowed into the United States.
This is true. The Ukiyo-e was a type of art creating that came form Japan and that impressionists were known for incorporating. The idea was called Japonism and was common in France who studied the Japanese arts extensively and found a way to incorporate their ideas in their art.
Serenity means the state or quality of being calm, tranquil, or serene.