What drew the immigrants to the united states?

Which of the following statements is true for all european union countries a. they each have their own hereditary monarchy b. they each have their own national currency c. each has its own democratic government d. each practices roman catholicism

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment

What from the columbian exchange had perhaps the biggest impact on the world?