In what year did the Boxer Rebellion take place, where Marines participated in a multinational defense force?

The Boxer Rebellion occurred in 1900, during a time of significant political turmoil and anti-imperialist sentiment in China. The uprising was led by a group known as the "Boxers," who aimed to end foreign influence in China. As tensions escalated, an eight-nation alliance, which included United States Marines, was formed to protect foreign nationals and restore peace. The U.S. Marines played a crucial role in this multinational defense force, helping to secure the legations in Beijing amid violent attacks from the Boxer movement.

The other years listed do not correspond to the timing of the Boxer Rebellion. The events of 1888, 1903, and 1906 are unrelated or refer to other historical contexts, making 1900 the only accurate choice regarding the rebellion and the involvement of the Marines.