State governments retain substantial authority over which of the following? A. foreign relations and trade and the enforcement of the criminal law.

B. military preparedness, the operation of schools, and the conducting of elections.

C. the value of the currency, foreign trade, and the conducting of elections

D. the operation of schools, the conducting of elections, and the enforcement of criminal laws

a historian who compares the expansion of political systems to the expansion of economic systems to the expansion of economic systems is organizing history by theme.

hope this : d

answer: /hbv

explanation: ,mnb nml; ,

the influence of charles louis de secondant , baton montesquieu.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)