Answer:
Three factors that are most important to the result of the Patriot victory in the Revolutionary War were the victories at Trenton and Princeton, Saratoga, and Yorktown. The victories at Trenton and Princeton raised the spirits of the Patriots and encouraged enlistments in the Continental Army.
The death of Archduke Franz Ferdinand collapsed the peace in Europe because Austria- Hungary started a war with Serbia because a Serbian student- Gavrilo Princip shot him dead. After this incidence, European countries built alliances and this lead all of Europe wading into the war.
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I'm sure it's more to do with making sure that students have a basic foundation of knowledge for the subject they'll be studying rather than some imperialist agenda, with more advanced classes being less and less centered on Europe. But while they're still developing the skills they'll need for these more advanced classes, it's probably just easier to keep things centered on Europe. It certainly doesn't hurt that Europe and its colonial diaspora have been very influential on the world stage over the last 500 years.
Answer:
because without it people would not know what to do and be lost. and we need those principal to have our country the way it should be.