They bought the land or went to war for it. The US citizens thought it was their destiny to own North American from ocean to ocean. This is called the manifest destiny.
As there is no image to explain from I will briefly describe various effects of Colombian Exchange:
The Exchange was of
species and crops between New World and Old World. This had many effects some
positive and some negative on both Worlds.
<span>A positive effect was
that new crops and species were introduced to both while there were some
diseases brought to Native Americans which they had no immunity against
resulting in fatalities. Another negative effect was the removal of Native
Americans for the economic needs of Europeans leading to death of many.</span>
Simple machines and man power. Egyptians used complex combinations of simple machines such as pulleys and levers to hoist heavy limestone onto each other. Of course, this also required a good deal of physical strength.
Hope I helped!
