What I did to win (as America) was to immediately pull back the troops that are stationed next to boston. Usually, a portion of the garrison will come out of Boston and attempt to capture Albany, Philidelphia, or NYC. what you need to do is ambush the troops when they are out in the open, NOT in a forest that gives them a defense bonus, as the British troops are much stronger than the American regulars, so you should also attempt to use overwelming force as well. after that, hole up in your cities and start pumping out soldiers, who take a lot less time to make than the Brits'. British ships will constantly bombard the defences of your cities, but rarely do they drop off troops outside of Halifax. Once you get a good force together, make a couple armies to take cities like Pensacola, Ft. Ritts, and Quebec. while this is happening, amass an army to capture Boston. be aware that a couple turns after that, a massive wave of hessians troops will arrive at Halifax, and you will probably lose at least Portland, and maybe Boston. Do everything you can to slow the Hessians down, as Spain and France rarely give any real help outside of random attacks by Spain on Mobile, and a couple French Frigates cruising around. If are lucky and are able to take and hold some cities of Britain, as well as holding your own, you will probably win a score or time victory, as it is just about impossible to totally destroy the British. Don't even bother with a navy, as British ships are better and more numerous that yours, and they send ships to block your harbors so that you cannot amass a fleet from several different cities.