At the time, America was not discovered, so they would most likely go to China or India.
The British do not want to make compromises.
The British have been oppressive and taking away colonists' rights.
The colonists have been unfairly taxed without representation in Britain's government.
The taxes colonists paid were not used to support US infrastructure.
Nobody else could build that canal. The Americans are the only people who could build them. They also made the Panama canal so that they could access the necessary territory.