Answer: The answer is B. You're welcome.
Poland. Just learned about this, and as far as I know Britain, France, and Italy all benefited from it
The primary concern was related to the number of congressmen from free and slave states. If Missouri was admitted into the Union as a slave state, the congress would have more Southerners than Northerners in the congress which would be bad for slaves everywhere. Northerners therefore asked that if Missouri enters as a slave state, Maine has to be separated and enter as a free state.<span />
The Sparta, Athens, and other Greek communities collected natural resources to build walls to protect them from external attacks. However, they eventually succumbed to attacks via the ocean route.