Historians are always trying to understand causes and consequences. Causes tell us how things happened (or changed) and consequences indicate the size and scope of the change. One would expect the biggest changes to have the biggest consequences. What would you say were the three most important changes that occurred from 8000 BCE to 1450 CE

d. migration

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.

answer; i believe that the correct answer is (tobacco);

during both period congress passed law restricting the civil liberties of american citizen that meet with the overall public support is the one statement that explain the rate scare of the 1920 and 1950 is very similar