In 1860, sending mail was not as easy as it is today. In those days, many letters were sent by ship. Other mail was given to travelers passing through town on wagon trains. It could take months before a letter arrived - if it arrived at all.
This graded reader printable worksheet was provided by Evan-Moor Corp and it comes with several comprehension activities such as 'match the date to the event', and a few others. The answer key is there, too.