One of the greatest compromises made that allowed the Constitution to be ratified was the inclusion of the Bill of Rights, which the Anti-Federalists insisted on since they didn't want the government to become too powerful.
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.
The Civil War expenses made the United States (US) became much more reliant on money in the late 1800s than in previous times. The need for money in funding the war paved the way for US to begin implementing income tax during 1862.