>>>Start at 0:13seconds

This is a depiction of America and Britain during the Revolutionary War, Britain is the one in the red uniform with one white stripe, America is in blue with an "X" out of the white stripes. The soldiers behind them are supposeed to be the colonial militia. The part at 1:25-1:39 is Britain and America when the first colonies were founded, that is why America is shown as a little kid. Britain says "Lets go home" because 'home' would've been Great Britain at the time, and Britain wanted America to become the colonies of Great Britain.

www.watchcartoononline.com/hetalia-axis-powers-episode-39-english-dubbed
>>>Start at 0:53seconds

This is when Finland(the first guy shown, he's all beat up), France(long blonde hair, thick accent), and Britain(short blonde hair, British accent) were fighting over who would take over the New World. The "strange little boy" is America when it only had a few settlements. France and Britain don't get along, that's why they keep fighting. Even as countries in the real world they don't. Britain's "Big Brothers" are the older countries that Britain came off of, which would be France, Scotland, and (I think) Spain. The guy with the paper that said "Curse" would be Britain's boss. And the guy with the hat would be the Bishop of the Anglican Church of Britain. The one the idea of making a new church spawned from. (stop 4:30, no need for end credits unless everyone wants a random Japanese song stuck in their heads.)