When did public education become widespread and why had it not happened earlier

According to the map, most mining occurs in the a.northern b.southern c.eastern d.western

For each statement, select whether it is true of the central pacific railroad, the union pacific railroad, or both. it began in nebraska. it began in california. it went through the sierra nevada. it went through the rocky mountains.

How do we make changes to the us constitution? a. through presidential order. b. through direct primary elections. c. through the amendment process. d. we can't!