Researchers have found a variety of humanmade tools, ceramics, metal, and leather, along with a mastodon jaw, tusks, and teeth and assorted animal bones, indicating long occupation of the site.

Beginning in 1639 and lasting for the rest of the century, the Seneca led an invasion of Western New York, driving out the existing tribes of Wenro, Erie and Neutrals.

[8] On April 7, 1806, Genesee's area was reduced to 5,550 square miles (14,400 km2) due to a partition that created Allegany County.

[9] On March 8, 1808, Genesee's area was again reduced, this time to 1,650 square miles (4,300 km2) due to a partition that created Cattaraugus, Chautauqua, and Niagara Counties.

[10] On February 23, 1821, Genesee's area was again reduced, this time to 1,450 square miles (3,800 km2) due a complex partition that produced Livingston[11] and Monroe Counties.

[12] On April 15, 1825, another partition reduced Genesee's area to 1,030 square miles (2,700 km2) in the creation of Orleans County.

[13][14] On May 1, 1826, the Orleans partition was again surveyed, with 10 square miles (26 km2) of land along the western half of the Orleans/Genesee border returned to Genesee.

[15] On March 19, 1841, Genesee's area was again reduced, this time to the 500 square miles (1,300 km2) it remains to this day due to the partitioning to create Wyoming County.

[16] Genesee County was included in the 19th century "burned-over district" — the Western region of New York consumed by religious revivals and characterized by "the evangelical desire to convert the entire American population to Christianity and to create a 'moral, homogeneous commonwealth.'"

[18] In September 1826, William Morgan, a resident of Batavia, New York, disappeared after having been briefly imprisoned for failure to repay a debt.

Morgan had been rejected from the Masonic lodge in Batavia, and, as a result, threatened to publish a book which exposed the secret rituals of Freemasonry.

The investigation into Morgan's disappearance confronted major obstacles from government officials and the judiciary- positions that were largely occupied by Freemasons.

[19] After continuous domination of Masonic politicians, citizens saw Antimasonry as a solution and an opportunity to restore justice and republicanism.

The party was originally associated with populist rhetoric, however, strong Antimasonic sentiment throughout the county correlated with positive economic developments and high population densities.

Larger towns, such as Batavia, the county seat and Le Roy, harbored the strongest support for the party.

[21] Genesee County is east of Buffalo and southwest of Rochester in the western portion of New York State.

Since then the closest a Democrat has gotten to winning the county was Bill Clinton in 1996 when he lost to Bob Dole by 3 percent.