What was the significance of the louisiana purchase

Which of the following is one example of an ideological conflict that became one of the causes of world war ii?

What initiatives were taken by americans to benefit the war effort? 1. americans planted home gardens to ration food for the troops. 2.american charities were established to provide aid to factory workers. 3.american companies joined together to make products more cheaply. 4.americans created clubs for promoting weapons to be used in the war.

How were castas paintings used to stabilize a society?