Whats the question send it to the commments so I can help u
Mostly due to the ideas of Manifest Destiny. They started going westwards with the desire to span the United States from coast to coast, and then they started going worldwide. The idea behind it is that the United States were destined to help the world become free and democratic like they were so they started helping people worldwide in rebellions against colonialism or in similar affairs.
Answer:
Within a short period of time their way of life was changed forever. The changes were caused by a number of factors, including loss of land, disease, enforced laws which violated their culture and much more. When the Europeans arrived they brought with them diseases unknown to the natives.
