Which one of the 6 territories that were brought under the flag of the United States was the most important to the growth of the country

Answer 1

The most important of the six territories brought under the flag of the United States was the Louisiana Purchase. This purchase doubled the size of the United States and opened up vast new lands for settlement and development. It also provided access to the Mississippi River, which was a major transportation route for goods and people. The Louisiana Purchase also provided the United States with access to the port of New Orleans, which was a major trading hub. The Louisiana Purchase was a major factor in the growth and expansion of the United States.