Answer:
would not cooperate with each other voluntarily.
Step-by-step explanation:
In the passage, Madison is expressing the view that a system based on a confederation of sovereign states would not be able to secure the objects of the Union, meaning the goals and purposes of the federal government. He argues that a voluntary observance of federal law by all the members could never be achieved. This means that Madison believed that relying on a confederation of states, where each state retains its own sovereignty, would not work because the states would not be willing to cooperate voluntarily with each other and follow federal laws. This led to the decision to write a new Constitution that would establish a stronger federal government with more powers to enforce laws and regulations.