My experience is that family tree are NOT sourced.
Yes, there are certainly vital records prior to 1900. Purchasing a book like “The Handy Book for Genealogist” will give you an idea what is available in an area and where to write for the records.
I used death records for most of my first four generations. A 20th C. death record will most likely give date of death, spouse, date of birth and parents! They cost from $3-10/each. Used along with censuses, etc. they will be good proof.
It sounds like you are trying to just use the web. It isn’t going to work. There is a saying, ‘The first four generations are on you..’ What is on the web is maybe 1% of the available documents.
The Federal Censuses (indexed, albeit not perfect) are wonderful. There are also other great records like draft registrations.etc.
Yes, I could tell you about early records but you are jumping too fast.