The Americans of tomorrow, the America that is every day nearer coming to be, will be too wise, too open-hearted, too friendly-handed, to let the least lastcomer at their gates knock in vain with his gifts unwanted.

How does this excerpt develop the central idea that espionage during the civil war was often carried out by untrained citizens? it enhances the reader’s understanding by explaining why training was unnecessary. it changes the reader’s perception of what information a spy was able to obtain. it explains an ordinary person’s motivation for conducting espionage against the enemy. it adds moral complexity to espionage, due to the use of secret and dangerous methods.