What does the writer imply in this line from the excerpt? the house, dooryard, barng woodshed was now all full, and when another crowd come i told 'em not to go away for want of room as the hog-pen was still empty.

The writer means to imply the speaker in the text is a highly humble individual by offering shelter to those who to ask for it.

Considering the speaker's house, dooryard, and barn were all crowded already with shelter-seekers, it is worth noting on their selflessness for inviting yet another crowd in one of their remaining empty spots - clearly the speaker doesn't mind sharing their place with strangers.

to convince americans of the importance of others.

that you cannot mess with fate and love cannot be controlled