Mystery at Lyndley's Fort

"Abigail," he might say,
"It's America's first day."

Before fireworks could burst,
one fourth of July came first.

Newly-free men gave a cheer
and we celebrate each year.

See its history in this rhyme.
telling of a special time.

Though a crook appears here, too.
Match the man to what he'd do.

What year did he play his tricks?
1776.