Why do people with similar views on an issue or cause form special-interest groups?

If they have similar views on a issue or cause then they could work together and find other people with the same view that they have to better the issue/cause.

Explanation: These interest groups represent interests that support and lobby for areas of special need. For example, the Sierra Club focuses on protecting the environment as well as the wild places on earth. They also focus on the education of people on preservation of the environment.

If they surround themselves with other who believe the same as them, it reassures their beliefs. An example of this is the Anti-Vax people. Instead of surrounding themselves with other who can argue their views, they are around those others who believe in the cause.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know