what happenened in the U.S. and around the world in 1873?

Dear lili66-ga,

You can access details of the events 1873 on these web sites.

First is Wikipedia. On the right of the page you can view the events
of 1873 by topic.
http://en.wikipedia.org/wiki/1873

On this page type 1873 in the ?All years? search box.
http://search.teach-nology.com/today/today2.pl

Scientific events of 1873.
http://www.answers.com/topic/1873

Media timeline for 1873
http://www.mediahistory.umn.edu/time/alltime.html#1870

Other searches you could try are,
history timeline 1873
://www.google.co.uk/search?q=history+timeline+1873&hl=en&lr=&start=10&sa=N
1873 "what happened"
://www.google.co.uk/search?hl=en&q=1873+%22what+happened%22&btnG=Search&meta=
1873 events
://www.google.co.uk/search?hl=en&q=1873+events&btnG=Search&meta=

I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder