It feared that Europe wanted to infringe on the newly gained US independence. They were afraid that European countries that were developed enough wanted to gain control of various portions of the American continent. This would limit the growth potential of the US as a country.
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A primary source tells you about a certain event that happened in the past and it's from that event. When studying historical events, historians want their information to be precise and correct. primary sources are firsthand, contemporary accounts of a certain event that was recorded by somebody who witnessed or experienced that event. Primary sources includes the original stuff and it's very important.
On April 9, 1682, at the junction of the bird-foot delta near the Gulf of Mexico, La Salle claimed the river and its drainage basin for King Louis XIV, hence the name “Louisiana.” In addition, he named the river Colbert in recognition of his patron and French finance minister Jean-Baptiste Colbert.