D. Ensure that European countries had roughly equal power
Answer:
Blockade
Explanation:
Basically blocking supplies from going in. From either allied ships or trade.
The U.s tried to remain neutral however, little things the opposing sides did began to change their stance. Britain propaganda, the sinking of ships by German U-boats, the final thing that pushed them over the edge was the "Zimmerman" note. A note that tried to get Mexico to declare war on the U.s.
Answer: C. Battle of Marathon
Explanation:
The Battle of Marathon was fought in 490BC between Athens and Persia in what became known as the first invasion of the Greek mainland by the Persians and was led by Darius The Great.
Before the battle, the Athenians sent a message to request help from Sparta but the Spartans declined involvement due to their observance of a religious festival.
Regardless, Athens and her Allies inflicted a crushing defeat on the Persians that kept them out of Greece for over a decade before Xerxes the Great invaded their shores once more.
This therefore must be the battle that the text speaks of.