sentences:  The map so impressed George Montagu-Dunk, 2nd Earl of Halifax, appointed president of the Board of Trade and Plantations in 1748, that Halifax opened up the official archives and solicited new maps from the colonies for Mitchell to make a new and better map.This was the map published in 1755.That is, the motive force for preparations against the French threat is understood to have come from a colonist who sought to take control of the colonies' future on behalf of the other colonists.