There were multiple significant social movements after World War I including:
1) Harlem Renaissance- This movement revolved around the explosion of African-American music, art, writing, and culture. During this era, many African-American citizens lived in big cities (like Harlem) and used their talents in order to captivate American citizens. This was a small step towards improved relations between white and black citizens, as they found common interests in things like jazz music.
2) Women's Rights Movement- Women played a significant part in the war effort during World War I. This prompted many women to demand more rights, especially voting rights. This movement that started right after World War I resulted in the passing of the 19th amendment, which granted women the right to vote.
Besides creating the judicial Branch, “The judicial power of the United States, shall be vested in one Supreme Court”, the Third article of the U.S Constitutions states in its Second Section that “The trial of all crimes, except in cases of impeachment, shall be by jury; and such trial shall be held in the state where the said crimes shall have been committed.”
So the answer to your question is:
The important right of the people that the third article speaks of is: “the trial of all crimes, except those of high treason or impeachment, shall be by jury.
Squanto and some other person. I don't know the other person.
