What action does lincoln encourage listeners to take during the gettysburg address?

How did political revolutions in the atlantic ocean basin affect or alter the institution of slavery and the lives of slaves

What is the difference between an independent and a dependent variable?

"if i have seen farther than others," said newton, "it is because i have stood on the shoulders of giants." who were the giants to whom newton was referring? could this be said of any scientific accomplishment? explain.