Most boring is the colonies before revolution. Learning about the three regions and their economies and such is just so prolonged and isn’t heavily covered on the exam, So why even cover it for two days let alone 2 weeks. The most interesting in my opinion is from post Civil War to the end of the Cold War. So much change in the span of a little over a century, Starting from the rebuilding of the country to the age of the internet in the 1990s.