The US foreign policy was based on the belief that the US should not get involved in other countries' business unless it directly affected the US. This was during the time of Washington.
In 1823, when Monroe became president of the US, the Monroe Doctrine was announced. This announcement had a huge change in the foreign policy of the US as it stated that the US was the only country that had the absolute right of colonizing any land in North, South or Central America.
This meant that the US opposed Europe and stopped them from taking over any land there.
I do believe that his advice and warnings about political parties is great. Political parties create division in the country, and could possibly lead to civil wars. As you can see from the past few presidential elections, things get crazy, and it turns into fighting and chaos. That’s why I believe it’s good advice.
Abraham was againgst slavery
Nationalism is patriotic feelings and having pride in one's country.