Help please, I will thank you later k.​

Which factor has played the most important role in changing the way history is studied over time?

Which of the following was used only once, to ratify the 21st amendment (repealing prohibition)? a. three-fourths of both houses of congress. b. three-fourths of the state legislature approved it. c. two-thirds of the state legislature approved it. d. ratifying conventions in three-fourths of the states approve it.

What was the result of delegates from the democratic party not being able to nominate a candidate in 1860