Post-War World.
I am not too certain
One of the best reasons for the colonies to unite was that the British army was far too large and powerful for the colonies to beat on their own. Even after they united it was very unlikely that they would win.
The Declaration of Independence was different from previous documents prepared by colonists because it: A.)committed the colonies to being independent.
Previous documents prepared by the colonists were always made with the assumption that British empire would oversee them and made intervention in case they believe the colonists would do something that harm them. The declaration of independence was the first one that provide the colonies with their own autonomy.
The leading reason as to why we went to war in Vietnam was to counter the "domino effect" where a non-communist country who borders a communist country had a high chance of becoming communist.