Question

What is the best summary of the first paragraph of "How We Entered World War I"?
The United States was not considered a great power until it entered World War I, thus beginning its continual involvement in world affairs.
The Spanish-American War gave the United States a basis of power so it could enter World War I as a great power.
The United States entered World War I as a great power but has not influenced world affairs in the same way since.
The United States has always been considered a great power, despite its desire to withdraw from world affairs.

Answer 1

"The United States was not considered a great power until it entered World War I, thus beginning its continual involvement in world affairs."

Reason: that statement captures the idea that U.S. status and sustained engagement in global affairs began with its entry into WWI, which is the central point of the paragraph.