Which statement best describes the idea of collective security?

"An attack on one is considered an attack on all."

Explanation:

Given that Collective Security is a term that describes a situation whereby individuals, group of people, state or countries comes together to form decision concerning security which ensures and agreed on the basis that the security of one is the interest of all, and therefore commits to a collective response to threats to and breaches to peace.

Hence, in this case, the correct answer is "An attack on one is considered an attack on all."

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.