should be control variable
<span>Eight years after the U.S. Supreme Court ruled unanimously that racial segregation in public schools was unconstitutional, in the 1954 case of Brown v. Board of Education of Topeka, he penned this cartoon expressing his dismay at the country's slow progress toward educational integration.</span>
Frequent use of metaphors is a key characteristic of the learning pattern
I would say it creates action potential
Hope this helps :3