There is many reason, one way they could've been worried about is if the
new settlers would make war or take their land and food.
Another way is that they could've cause the Mexican to come of their land.
Hope it helped
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Enlightenment ideals propagated by the French were influential in causing the American Revolution, and the success of the Americans inspired the French Revolutionaries. ... While not recognized as a 'cause' of the French Revolution, it is clear that the U.S. move for Independence from Britain changed history.
Muckrakers were the journalists who uncovered corruption in businesses and government.
Cite other cases that come to simular conclusions.
