Plz help this is due 11:30...
I'll mark the brainliest...​

Substance abuse

Explanation:

Substance abuse is when you have no control on how much amount of substance you use , which can result in bad health issues also it can affect a person mentally to the extent where they need help.

b) to encourage free trade

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.