Spain is the first one that comes to mind. But South/North Korea is also a peninsula as well.
Answer:
Slavery was a topic of debate that threatened the hopes of a new federal constitution and the very union itself. Many southern states wanted their slaves to be counted as part of their population. This would give slave-holding states an advantage in the House of Representatives and in the Electoral College.
Fallout shelters are still someone in use but not for the purposes of nuclear fallout, only severe storms, etc. Th Interstate Highway System is the best choice from this list.