The united states became involved in the war with germany because
germany invaded the u. s.s. r.
germany declared war on the u. s. after japan attacked pearl harbor.
german submarines began sinking u. s. merchant vessels.
americans died when germany bombed civilian targets in great britain.

the correct answer that would best complete the given statement above would be option b. expanding civil services. diocletian and constantine paved the way for foreign invasion by dividing the empire, creating administrative bureaucracies and reorganizing the military, except for expanding civil services. hope this answer .

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explanation:

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions