As a child we had a Mimosa tree in the front year. I loved that thing. It would get big fluffy balls that were a pink flower. I've got great memories of my Father and I attached to that tree. It was always fun to make the leaves close up.

Then I moved to where I live now and the fields have been taken over with the "sensitive plant", it's an invasive species here. It 's a cool plant but spreads like the dickens. It's less dense in it's foliage than your specimen and it has yellow to orange flowers.
https://www.wildflower.org/plants/result.php?id_plant=chnin