1. Key differences between 1500-1800 and today’s modern world, include on how food was produced and what was eaten in the 1800’s, what expectations befell women and men in their roles and where people of the 1800’s acquired their information and what they believed.
2. Your life would be filled with difficulties and often you would face a insurmountable challenge because the land is difficult to farm, there were few building materials, and harsh weather, insects, and inexperience led to frequent setbacks.
4. The Americans thought they were special because they thought that they were "chosen" by Providence to spread American ideals, and their population kept growing, so they needed to expand Westward. This territorial movement displaced most of the Native American peoples who lived in those lands for thousands of years before the arrival of European colonists.
Sorry I couldn’t answer number 3 but I hope I helped you.