The first true victims of American Imperialism were the Native Americans. As settlers slowly pushed West, native peoples were killed, forced out, or forced to assimilate into White American culture. Land would be set aside to "house" these many peoples, but even that would soon be settled. Native lands were slowly chipped away until they look as we see them. Many groups went from hundreds of thousands of miles of territory to a few hundred acres. Sometimes the land they were "given" wasn't even in their ancestral homeland, but thousands of miles away. Around the same time Americans would rob many Mexicans of the lands that they had settled and farmed for generations.
Positive: higher population, more facilities, such as parks, roads and recreation centres
Negative: buisy, noisy, tight
Reign of terror............................................................................i believe
1The power of the Executive Branch is vested in thePresident of the United States, who also acts as head of state and Commander-in-Chief of the armed forces. ... Fifteen executive departments — each led by an appointed member of the President's Cabinet — carry out the day-to-day administration of the federal government
With economic stability came the need for warriors, as food became more plentiful, people were freed up to serve as community leaders, and as settlements developed, leaders emerged to help organize and regulate these budding civilizations. Hope this helps.