Knowing of the likelihood of the Negroes to rise during the French and Indian War, Governor Dinwiddie wrote Fox one of the Secretaries of State in 1756: "We dare not venture to part with any of our white men any distance, as we must have a watchful eye over our Negro slaves, who are upward of one hundred thousand."[22] Brissot de Warville mentions in his _Travels of 1788_ several examples of marriages of white and blacks in Pittsburgh.
He noted the case of a Negro who married an indentured French servant woman.

Out of this union came a desirable mulatto girl who married a surgeon of Nantes then stationed at Pittsburgh.

His family was considered one of the most respectable of the city.

The Negro referred to was doing a creditable business and his wife took it upon herself to welcome foreigners, especially the French, who came that way.

Along the Ohio also there were several cases of women of color living with unmarried white men; but this was looked upon by the Negroes as detestable as was evidenced by the fact that, if black women had a quarrel with a mulatto woman, the former would reproach the latter for being of ignoble blood.[23] These tendencies, however, could not assure the Negro that the Northwest Territory was to be an asylum for freedom when in 1763 it passed into the hands of the British, the promoters of the slave trade, and later to the independent colonies, two of which had no desire to exterminate slavery.
Furthermore, when the Ordinance of 1787 with its famous sixth article against slavery was proclaimed, it was soon discovered that this document was not necessarily emancipatory.