Missouri Compromise was a plan agreed upon by the United States Congress in 1820 to settle the debate over slavery in the Louisiana Purchase area. The plan temporarily maintained the balance between free and slave states. ... Slavery was legal in the Territory of Missouri, and about 10,000 slaves lived there.
They allowed for much stronger and more durable weapons.
Answer: Wanted to expand westward but were not allowed to.
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Throughout history??? if that is the case then...
Germany-WWII
Japan-WWII
Soviet Union-Cold War