The answer is A “Through military action by the united states”
Answer:
Chandragupta Maurya
Chandragupta Maurya (c. 321 - c. 297 BCE), known as Sandrakottos (or Sandrokottos) to the Greeks, was the founder of the Maurya Dynasty (4th-2nd century BCE) and is credited with the setting up of the first (nearly) pan-Indian empire
Explanation:
The primary causes were that Sparta feared of the growing power and influence of the Athenian empire
Alexander had previously prepared takeover by defeating the Persian army at Issus and captured the Mediterranean eliminating the threat of a Persian naval invasion. As well as keeping Persian land reinforcements from coming from the West, which was key in focusing on other points.