Answer
The Zimmerman note finally turned the eyes of the American public towards declaring war on Germany, they finally snapped after Germany's attacks on a American ships.
Faith in socialism, capitalism or communism prevents the rise of fascism because it combines aspects of these things but is different from them all. The idea that democracy is failing can help it rise. Hitler exploited the instability of Germany's democracy and the failure of the coalition governments to push for total power, presenting the idea that Germany needed a 'firm hand' for 4 years to get back on steady footing.
Maybe the us will think that the Germans are going to attack them more
Obama's visit was historic considering that he is the first American president to ever visit the country. What is also interesting is that the US bombed Laos in the 70s with over 2 million tons of bombs. During his visit, Obama promised that the US would double its financial aid to the country over the course of the following three years, which was also an interesting part of the visit.