Mason-Dixon line
Mason and Dixon line
Mason and Dixon's line

There had also been a few south of the Mason-Dixon line.

Eight of the ten most charitable states in the country are below the Mason-Dixon line.

When it comes to winter and school, my kids wouldn't know they crossed the Mason-Dixon line.

He then began to work his way along the Mason-Dixon line and finally across the South.

He became the first black research chemist hired by the federal government south of the Mason-Dixon line.

He would be doing business with or for some firm or other based north of the Mason-Dixon line.

Any college wants me to play ball for them better be below the Mason-Dixon Line.

The team is considerably south of the Mason-Dixon line.

"And there are people who try to put slavery into a neat package as something that only happened south of the Mason-Dixon line."