Let's take a look at the name: colonies. If a land is a colony, it is a colony of something, that is, there is some other land that has control over it: in this case this was Great Britain: Great Britain had claims and control over the colonies.
The reign of terror crossed the line of Justice. They arrested anyone who might be disloyal and kill hundreds by the guillotine. It was a blood bath. Robespierre was in charge and killed anyone who he thought was the new revolutionary time. He went overboard with the killings. The reign of terror ended with the the guillotine of Robespierre.
Isolationists didn't want to join European schemes or war efforts. The Lend-lease program was a program by the government to help send help to Europe but isolationists wanted to stay on their continent and not participate in any of the affairs there.
