A variety of reasons. The ongoing debate about federal power had tipped to the side of the 'Federalists,' for one thing. But also, and perhaps more importantly, the practical experience of the nation during the War for Independence had demonstrated that, without a stronger federal government, it would risk failing in its 'grand experiment' of republican self-governance.
Answer:
The US government wont even exist if it did not declare independence from the UK couple hundred years ago
Explanation:
The first one "Both dynasties promoted in principles of Buddhism." is one of them (I'm positive) and I'm thinking the lats one "Both dynasties maintained a standing Army, but I'm not positive about this one!!
Answer: The Burmese Communist Party said that it was part of "an imperialist plot", claiming that Aung San had been in discussions with them to form a "united front" government, and that the assassination had been carried out to prevent this.
Ok, so that there is a bunch of stuff. There is evidence that President Roosevelt knew there would be an attack on Pearl harbor, but he decided to let it happen so that the US would be in on the war (we were not before the attack).
There's not a straight forward answer, but I hoped this helped!