Analyze the concepts of Western Migration and Western Invasion and justify American advancement.

Migration is the movement of people from one place to another, due economic, social, political or environmental reasons. Due to this America has advanced as migrants have migrated with skills, knowledge and resources which have benefited the country. Western invasion has also brought about such benefits. Both western migration abd western invasion can be lengthy processes, supported by lots of planning and preparation, however they can also be fast acting.