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.
Thomas Jefferson's presidency had an enormous affect on America's national identity. One of the biggest contributions made by Jefferson was his focus on limiting the size and scope of the federal government. Minimizing the power of the federal government is one trend that other presidents do follow and continue to follow to this day.
The War of 1812 also shaped America's national identity. This war against the British resulted in the US showing their military strength/determination by holding off the British from taking back control of America. This also was the first military conflict against a country after the creation of the US Constitution. This helps to develop the idea that America will be a country that stands up against nations who they feel are threatening our way of life.
You could start off with the news report about how Soviet and U.S almost started another war due to a missile crisis with Cuba or how soviet's government is different from ours. Basically compare and contract Soviet and U.S.
Hopefully this can get you a head start
Have a great day :)
It is derived from the word Consulate... in french? But, it means higher power or panel of leaders.