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Into History.

com. It's July 27th, 19 at Lake Michigan in the south side of Chicago, Illinois.

A teenage boy cools off in the water with four friends.

They spent most of the previous day building a raft.

Now they're happily floating on it out on the lake, taking turns jumping in the water.

A teenager turns away as one of his friends Eugene

cannonballs into the lake to create the biggest splash yet.

A moment later, though, the teenager is soaked by another spray of water.

Puzzled, he looks around and frowns when he sees a man on a nearby breakwater holding a rock in his hand

and shouting angrily.

Before the teenager can warn his friends, the man throws the rock at the raft and stoops to pick

up another. The teenager realizes with a start that he and his friends have drifted far from where they launched and crossed an informal line marking where the water is divided.

Everyone in Chicago knows that this side of the line is for whites only,

but the teenager and his friends are black.

The boys on the raft begin paddling as hard as they can to get back to the black only part of the lake as the white man on the breakwater continues to hurl rocks at them.

After a few moments, they're far enough away that the man can't hit them anymore.

But when the teenager looks back, he sees his friend Eugene lying face down in the water,

a cloud of red blood swirling around his head.

The man on the breakwater is still throwing rocks at

...