Well they can fly duhh. But there are other things as well they are very good hunters believe it or not birds have to use certain techniques to catch and find worms and other foods like the eagle as big as an eagle is the fact that it can make a top notch stealth approach on any of its prey is amazing. The way birds learn to fly is crazy but fascinating while birds are babies the parent pushes them off a high tree branch and wait till they get to a certain point if they don't fly they swoop down and catch them and do it again. This is to build the instinct within the baby bird to flap their wings. Now... When the bird gets to a certain age they should know how to fly unless they've broken a wing from all the times of falling from 80 foot trees or higher. But anyway the parent pushes them off for the last time and if they fly they go away and stay away forever but if they don't the parent must let them fall to the ground because at that point the bird won't survive in case of a predator attack.
It is because the Americans started to see all the other countries become free and they wanted to become free to. They also started to not like the way the British treated them.
