1) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.

2) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.

3) The Andes, stretching along the western coast of South America, is the longest mountain range in the world, spanning over 4,300 miles (7,000 kilometers).

4) The word "pizza" contains two vowels: I and A.