Depending on the time period, America had a difficult time remaining neutral for several reasons.
World War I
America had a difficult time remaining neutral during World War I because of Germany's actions. For example, the German submarine sank the Lusitania, a boat that contained over 100 American citizens. Along with this, the Germans were also caught trying to make a secret alliance with Mexico. This was exposed when the Allied powers intercepted the Zimmerman Telegram. Considering these factors, the government felt the US had no choice but to break their neutrality and enter World War I.
World War II
The US had a difficult time maintaining neutral in World War II due to the violence and rise of dictators like Hitler. Along with this, the US was also attacked by the Japanese military. The Japanese military bombed Pearl Harbor on December 7, 1941. This attack on a military base prompted the US to break their policy of neutrality in order to enter World War II.
The correct answer to this open question is the following.
Although the question has no options, we can answer the following.
After 600 BCE, the world witnessed historical developments such as the surge of the Phoenicians in the Mediterranean Sea, a great group of sailors that built impressive ships for their time and developed the first kind of alphabet.
In that time, there were also important advancements in philosophy and religious beliefs such as the rise of Confucianism and Daoism, in China, or the influence of Zoroastrianism in the region of Persia, during the rule of the Sassadine dynasty.
The United States often uses sanctions to impose a penalty on a country. This is usually the first step taken when a country upsets another country, before violence is used.
The Spanish were in search of gold and other riches.