In your own words, describe the meaning of this year’s NHD theme, Breaking Barriers in History.

Which of the following statements was true about lincoln's popularity at the time of the gettysburg address? a) he was just as popular as when he was elected. b) he was more popular with southerners than he had been at the beginning of the war. c) his popularity was very high. d) his popularity was very low.

Match each model with its name and the name of the scientist who created it.

What type of legislation has the member of congress introduced? a: a joint resolution b: a concurrent resolution c: a private bill d: a public bill