What is the difference between isolation and imperialism?

Isolationism is a foreign policy that avoids extensive defense and trade agreements with other nations. This is done to avoid wars or some type of economic problems. The US tried this policy for many decades, however, this policy fails to truly provide security against powerful and highly technical nations that can reach worldwide to cause problems, serious ones at that.

Imperialism involves the policy of taking control of other nations in order to profit from their weaknesses. This type of policy may not be sustainable as history has so often pointed out.