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Explanation:
<h3>A: United States was not considered a great power until it entered World War I, thus beginning its continual involvement in world affairs.</h3>
<span>We form the will-future with the auxiliary will and the infinitive of the verb. We use the the same form of the verb every time regardless the subject. In British English we sometimes use shall instead of will for the first persons (I/we). hope this works.</span>
What book is this question asking about?