How is organizing history by theme different from organizing history by region ?

Ahistorian who compares the expansion of political systems to the expansion of economic systems is organizing history by

The national security act of 1947 reflected:

What were the immediate effects of prohibition? check all that apply. bootleggers illegally made and sold alcohol. corruption and crime increased. speakeasies were the only legal places to buy alcohol. crime and corruption decreased. alcohol sales were banned in the united states.