Hi!
There are C. 100 US Senators.
Because the need to "repeal" amendments was sometimes necessary and desired by the people, as in the 18th amendment.
I assume that the question is not necessarily directed at people, but that it can refer to the training of animals, such as dogs.
The most effective kind of reward is food and praise - and this is in fact the kind of reward most commonly used in dog training.
Squanto was a Native American who helped the English colonists in Massachusetts develop agricultural techniques and served as an interpreter between the colonists and the Wampanoag. He taught the English how to plant and find food. Also to hunt. He was one of the few who spoke English. The corn was very important to the Americans survival.
German immigrants asking the United States to support Germany in World War I