What does the term secondary source mean?

What might balance federal and state powers present a problem

When i lost my job, i didn't lose my health care the affordable care act. i just saw a democratic party to commercial, though, explaining that health care is going to be one of the main issues in the next election. i'm ashamed to say that i don't always vote, but i certainly will this time around. iwant to make sure everyone has health coverage when they need it. which role of political parties does the passage most clearly illustrate?

How did americans disagree over the role of federal and state goverment before and durning the civil war