Based on this sentence from the first paragraph, why does Hamilton think it is important for the United States to be successful?

It has been frequently remarked that it seems to have been reserved to the people of this country, by their conduct and example, to decide the important question, whether societies of men are really capable or not of establishing good government from reflection and choice, or whether they are forever destined to depend for their political constitutions on accident and force.

Its success will give more power to other rulers around the world.
Without the United States, governments around the world will fall apart.
Its success will show that it is possible for people to make their own government.
Without the United States, people will have no reason to behave civilly.