Hello!
The statement means that the power of the government can only be as strong as the people and citizens allow it to become. The colonists believed in a democratic government, which means that the citizens hold much political power, and make many political decisions regarding the government (voting, for example). They did not want the United States to fall under a monarch or dictator.
The second part of the question asks if you believe that the people still hold main power and can regulate the government's power, or if you do not believe this. This question is based on your personal opinion, so you can answer it as you truly believe!
I hope this helps you answer your question! Have a great day!