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Explanation:
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One of the most important elements of the Northwest Ordinance of 1787 was that the Federal government would be sovereign and would expand westwards in hope of founding new states, instead of expanding existing states. This was important for the growth and expansion of the United States (had this not happened, the United States would not be half of what it is now). Another important aspect of the Northwest Ordinance of 1787 is that slavery was prohibited and this was basically the border between free and slave states.
The primary reason for European colonization of Africa was capitalism. European nations saw an opportunity for new trade routes and potential wealth in some of Africa's natural resources. The geographical limitations of Europe were also a factor.
When it says that "The United States found itself fighting a war on two fronts" it means that the US was involved in a war where they were forced to fight in two different locations. For example, the United States faced a two front war during World War II. The US was forced to fight in the Pacific Ocean against the Japanese Empire while also fighting against Germany in Europe.
A two front war makes it much more difficult for a country to have success, as they need to split up their resources between two different places instead of having them concentrated in one area.