Sea explorations were made by many countries centuries ago. These were headed by the European countries long back. The impulses or urges that influenced the explorers are to desire to take hold of other land for territorial expansion.
Another very important thing to consider as well was the trading. One country had to exchange products to another country. Hence, there were need for them to cross the seas.
I can't see the text but as for your question most of the history in the history books seem (to most) to have happened a lifetime ago so they don't really see how it retains to them and their lives. They live in the present time so they want present events. I believe that although past history is important to learn, we must also take notice of the historic events that are taking place right now. It lets us know what countries are doing (I.e war,trade,ect.) as well as our own and how we are involved in the affairs we are currently in. Most importantly it as a lesson and a reminder to the future generations on how certain events caused certain destruction. It is a stain in time so to speak so they will not take the action's we took in the past to lead them to the repetition of our past and current mistakes.
House slaves had on call schedule of 24/7. These kind of slaves
typically lived better than of the field slaves. They generally
had better food and
were occasionally given the family's cast-off or used clothing. They slept in
cellars, garrets, and hallway in great houses.
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