Best approach to buying tools?

I only use Craftsman. I have stuff that has all been bought by me and me alone, I dropped $3500 as a 25 year old on tools I knew would last my lifetime and one day be my sons... he was born in 2007 I am almost 42 now so you can do that math. There are some of their tools still US made I just saw some at Ace Hardware less than a week ago. I think I saw on Garage Journal there are ways to determine where the tools were made by the catalog number or some such info.