Why was the albany plan of union proposed? to protect the colonists against the spanish to serve as a model for the constitutional convention to strengthen the colonies against the french.

The Albany Plan of Union was proposed to strengthen the colonies against the French.

Explanation:

The Albany Congress was a meeting convened by the British Chamber of Commerce in 1754 in Albany, New York, United States. In this assembly it was advocated by the union of the English colonies in North America, to guarantee to some extent a defensive alliance against the French before the attack of these and for the Indian Wars.

a memoir is the correct answer