Because of the weakness of non-states (ones that werent official, just groups of people who called themselves states), and European powers had strong econimies and a well organized government. Hope this was useful :P
Elaborate your question more about who you need the information
Like policy of each ??? What ?? Presidents !! But which presidents ?
Sorry
They ended up colonizing North America for different economic reasons. Spain colonized America because they were searching for gold and silver. They did find a lot of gold and silver when they conquered the Aztec and Inca Empires. France colonized North America because of the great amount of furs they found there and to create trading posts.
The short answer is no, changes in the young nation did not open the door to opportunity for all Americans, since a large number of people in the United States during this time, such as slaves and women, had practically no rights.