It would be unjust to suppose that the patriotism and the zeal that every American display

It would be unjust to suppose that the patriotism and the zeal that every American displays for the welfare of his fellow citizens are wholly insincere. Although private interest directs the greater part of human actions in the United States as well as elsewhere, it does not regulate them all. I must say that I have often seen Americans make great and real sacrifices to the public welfare; and I have noticed a hundred instances in which they hardly ever failed to lend faithful support to one another. The free institutions which the inhabitants of the United States possess, and the political rights of which they make so much use, remind every citizen, and in a thousand ways, that he lives in society. They every instant impress upon his mind the notion that it is the duty as well as the interest of men to make themselves useful to their fellow creatures; and as he sees no particular ground of animosity to them, since he is never either their master or their slave, his heart readily leans to the side of kindness. Men attend to the interests of the public, first by necessity, afterwards by choice; what was intentional becomes an instinct, and by dint of working for the good of ones.

请帮忙给出正确答案和分析，谢谢！