The era of the Soviet Union
There is a run on sentence
Somalia, situated in the Horn of Africa, lies along the Gulf of Aden and the Indian Ocean.
I believe this is an example of either situational or dramatic irony,
The correct answer is 'Yellowstone National Park, the West's oldest national park, is the site of Old Faithful'. 'Yellowstone National Park', 'West', and 'Old Faithful' are all proper nouns, so they need to be capitalized. 'National park' does not need to be capitalized, because 'park' is a common noun, and 'national' is just an adjective describing it.
Hope this helps!