The similarity between Puerto Rico and Guam is that they both became territories of the United States after the end of the Spanish-American War. Hence, option B holds true.
The Spanish American War was a battle held between Spanish colonists and the Americans in the years during the end of the 19th century. The rule of Spanish colonists came to an end, as the US won the war.
Not only did the Spanish colonial rule end, but it also led to the transfer of additional territories such as Puerto Rico and Guam under the control of the US administration.
Hence, option B holds true regarding the significance of the Spanish-American War.
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