Strongest research design for a study which is hoping to determine cause and effect?

Writing prompt: read the article, “ending school segregation in the us.” why is the event described in the article taught in schools today? what are the lasting lessons that we can learn from studying this event? support your response with textual evidence. 1. read the article. 2. consider the answers to the questions. 3. use the race graphic organizer to organize your thoughts. 4. construct a paragraph using the race writing including textual evidence (see textual evidence notes for assistance with how to include this information) from the article and answers to the question. 5. check for capitalization, punctuation, and grammar.

What occurred during the free banking era? the dollar bill was introduced. the second bank of the united states was established. repaying of loans was not closely monitored. currency varied widely from state to state.

The principal effector function of igm is