Guns and gun powder
during this time the natives in America were still using spars and arrows, with those weapons they practically stood no chance against the Europeans.
Yes, a map's legend/key helps the reader determine what symbols or images represent on a map. For example, if there was a brown line going a cross a river on a map, a legend/key would help the reader figure out that that symbol is a bridge.
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They both caused a lot of Native Americans to be wiped-out from diseases, that they brought to the new world.
Proponents of the North American Free Trade Agreement (NAFTA) argued that it would help the U.S. economy by "<span>b. opening up new markets for the export of American goods" since it formed alliances. </span>