Because the people in the colonies originally came from Europe so the leaders of the countries that wanted the right to the colonies believed since that is their people it’s their colony
A reliable source
An unusual source means it could be wrong, and ancient source could contain incorrect information according to new information known in modern day, and although a source may be relevant, that does not necessarily mean it has correct information; it only means the information is connected to the subject you are researching.
Probably being honest about the US. (Even the bad things) and being honest that you make mistakes, oh and don’t be full Ig yourself
The 14th amendment granted former slaves citizenship to all people born or naturalized in the United States which included former slaves who had just been freed after the civil war.