Slavery tolerated because of "necessity" means that you do not really want to do it, but you think you must do it. An example is when you have a farm and you need people to work on it. The trouble behind this scenario is that your farm isn’t making money to pay your farm helpers their proper wages, so you resort to slavery. In this case, you do not need money for salaries because your farm is doing well to keep your slaves clothed and fed.
Slavery affirmed as a "moral right" is when you think it is your right to be the master and the slaves deserves to be slaves.
To prevent the spread of communism to the south Vietnam
I believe the answer is the first one
Answer: They asked Congress to enact a law giving women in the United States the right to vote. These women also requested to speak before both houses of Congress about this issue. Petition for women’s voting rights following the 15th Amendment extending rights to men, regardless of race/ethnicity.
Explanation: The petition asked Congress to enact a law giving women in the United States the right to vote. These women also asked to speak before both houses of Congress about this issue. In the year following the 15th amendment’s ratification, a women’s voting rights petition was sent to the houses of Congress requesting women’s suffrage rights and for women to speak on the floor of Congress.
World War 1 or First World War was known as the Great War or "The war to end all wars", before the beginning of the Second World War.
The principal countries involved in this war were Russia, France, Britain, Italy and the United States of America in one side, and Germany, Austria-Hungary, and Turkey on the other side, forming two opposed alliances: The Allies and the Central Powers.
This war began because of a Serbian nationalist, who killed Archduke Ferdinand, heir of the Austrian throne. Because of this act of terrorism, a great war started, and that come to be known as the major European conflict in a hundred thousand years.
