Americans participation in Westward expansion during the mid- to late 1800s

Was it worthwhile for Americans to participate in Westward expansion during the mid- to late 1800s? Support your response with evidence from the time period. Introduction: Background and thesis (statement of what you are arguing/proving) Body Paragraph 1: First reason for worthwhileness with historical evidence Body Paragraph 2: Second reason for worthwhileness with historical evidence Body Paragraph 3: Third reason for worthwhileness with historical evidence Conclusion: Summary of main arguments