1) The word "country" contains three vowels: O, U, and Y.

2) The Northern Lights, also known as the Aurora Borealis, are natural light displays that occur in the polar regions due to interactions between the Earth's magnetic field and solar particles.

3) The concept of civil rights pertains to the rights and freedoms that individuals possess as members of a society, including equality before the law, freedom of expression, and protection against discrimination.

4) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.