1) The word "music" contains two vowels: U and I.

2) The Treaty of Tordesillas, signed in 1494, divided the newly discovered lands outside of Europe between Spain and Portugal, leading to the colonization of the Americas.

3) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.

4) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.