Which three factors allowed for the development of the four river-valley civilizations of Mesopotamia, Egypt, the Indus Valley, and China?

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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.

after the french-indian war.