Answer:
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
Explanation:
The main reason why the twenties are sometimes called an "age of prosperity", especially in the United States, is that "<span>A.Incomes throughout the United States grew and the middle class held most of the wealth," due mostly to speculation in the stock market. </span>
The Ku Klux Klan often took drastic, and violent actions towards the blacks. Making it very hard for many of them to survive in a safe manner.
Lincoln freed the slaves by signing the emancipation proclamation.
The group which use literacy tests during the post Reconstruction years is the African American and the correct answer among the choices you give is letter D. I hope you are satisfied with my answer and feel free to ask for more if you have a question and clarifications
