Hi Romilly: Bob is mostly right. Some U.S. states make their BMD records (or indexes) available online, but many of the BMD projects are volunteer and very local--usually at the county level of individual states. These are loosely coordinated by the USGENWEB Project, which you can search on the Web and then find individual state and county pages.
The best thing for you to do is to post a look up request for U.S. federal census information on the USA board here at Rootschat with names, dates, locations, etc. Depending on when they came over, you might also find registrations for the World War I and World War II drafts, addresses in directories, and so on. WIth the U.S. Social Security Death Index (the closest we have to a national death index), you may be able to find out information on relatives who passed away after 1962 (and who had a Social Security number).
If you want to do some looking on your own, you can go to the FamilySearch Pilot site (maintained by the LDS), where you'll find Wisconsin and U.S. censuses.
The site is at
http://pilot.familysearch.org/recordsearch/start.html#p=0When you get to the site, click on the "Browse our record collections" link just under the search boxes, then click on the map of the U.S., Canada, and Mexico. When scrolling down to examine the collections and when searching with in them, be sure to use the scroll bar on the right. Otherwise you'll have problems navigating.
If you want to order BMD certificates, you can go to the Wisconsin Department of Health Services vital records page at
http://dhs.wisconsin.gov/vitalrecords/index.htmRegards,
John
