Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: A high-level US delegation just returned from Ethiopia, which is arguably America's closest ally on the continent of Africa. How did these two countries become so close? Journalist James Jeffrey explains.

How did US and Ethiopia become so close?