One reason why the states should ratify the constitution is because they had a weak central government and also the nation was falling apart. In this reason it was saying that there Central government was very weak and the nation was falling apart.
This powerful government will not be able to take away the rights of the people as some fear it might. What this reason means is that when the government is gone the rights will still same but other people believe that its going to change and also that's how they are going to fear it.
The powers are limited and divided among three branches of power. This is the only way to ensure the survival of our young country. This reason is that, so that no one gets to have all of the power and also that people can be even about that.