What are not native americans adapting to their tribe

What would lead a historian to consider two events to have a relationship of correlation rather than causation

What was a major component of reaganomics? 1. the belief that tax cuts to the wealthy would trickle down to the less fortunate. 2.the belief that providing tax cuts to lower-socioeconomic americans would boost the economy. 3.the belief that boosting home ownership would lead to americans having an investment in the economy. 4.the belief that correcting the business cycle would boost output and reduce unemployment.

In ww1 where did france find laborers to with their war movement? ? & what country did the french fear?