The product, while worthwhile, is marketed by the LDS Church, here in the U.S. They have the world's most extensive collection of genealogy records.
Problem is, it tends to feature U.S. records over European. That's not to say such records aren't available, but the basis for the entire collection, in my opinion, rests on the 10 year census taken here in the U.S. as mandated by our U.S. Constitution and goes back to 1790, with several partial State records as well.
Here, the watershed for census records was the year 1850 since that's when extensive additional data were included… items like the father's State of birth, actual names of all children and a more relative actual place of residence.
There are, of course many other records but, again, the base is the Census'.
As an aside, unfortunately, time wise, one of the most important census' would have been the 1890 census, since the U.S. had experienced a decades long internal migration following the Civil War (1865) and would have held treasure troves. However, the census was collated and then filed in the National Archives in Washington D.C., only to burn to the ground within the year. Only partiaal records of some States survived… pity...