Who was the chief organizer of the spy ring that passed secrets to the soviets through klaus fuchs?

Which of these belongs to the united states after the spanish american war ?

What was one effect of the emancipation proclamation on african americans in the north?

Ihonestly don't know how to revise, like i'm struggling so much to remember things and i really don't know what to do at this rate. does anyone have any advice? especially with american history, i've got 5 topics in this section.