Many modern day activities follow the Groundhog Day style of activities but historically has its roots in the ancient Christian tradition of Candlemas
There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
Designed by Fredrick Olmsted and English architect Calvert Vaux
The message that he was trying to get across to everybody, was that they were strong enough and capable enough to break free from England all together. Also, he was making it clear to the king of England that the new people of United states were not afraid to break free. His whole goal was to persuade the people that they should break free because, for one, the king was already taxing them to death, and two, the king still had control over them and he still had their loyalty even though they left. He wanted to make them realize how important it was for them to try to break free of Europe's control and to officially make the United States of America.
I hope this helps you. :)
To survey the land and track a route to the Pacific Ocean