How was the culture of plain indians changed

Their culture changed drastically in the early 16th century, when European newcomers introduced them to the horse. The horse enabled them to travel much faster across greater distances which meant that they could follow and hunt buffalo more easily. Since buffalo was the main resource, not only for food but also for tents and clothing which were made from its skin, as well as for domestic objects made from its bones, this revolutionized their culture, enabling them to live more securely. By the 18th century they became full-fledged nomadic horse cultures and the horse became a central symbol of their lives. Aside from being appreciated because of the utility and the lifestyle it made possible, the horse also became a symbol of social prestige and a cultural object, referenced in stories and songs from the time.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.