The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The important ideas that Lincoln said the United States was dedicated to protecting when it was founded were the following.
The idea that the United States was conceived in freedom and liberty. People desired to be free and that is at the basis of the foundation of the United States.
The founding fathers "dedicated to the proposition that men are created equal," which means that there should be respect for diversity in people's beliefs as part of the foundation of the new nation.
What best describes Lincoln's message in this section of the Gettysburg address is Democracy and the United States would last.
This is implied in Lincoln’s idea when he says that “the government of the people, by the people, for the people, shall not perish from the earth”, meaning that the U.S, and democracy will live forever and nothing is able to destroy them.
On November 19, 1863, President Abraham Lincoln delivered the Gettysburg Address speech after the American Civil War. The speech was part of the dedication of the Soldiers' National Cemetery in Gettysburg, Pennsylvania.