history in NY or sweden 1800-1923-today

I am seeking information on any Hagstroms from the NY area with Ties to Sweden, My Grandfather lived in NY believed to come over from sweden. I know he fought in WW1. My Father Paul H Hagstrom was born in brooklyn NY in 1923.still reasearching to find more Do have very old Photos. I have some info dating back into the1800's