One main reason why John C Breckenridge supported the purchase of the Louisiana territory was because he thought it would held end the issue of slavery, by leaving it up to "popular sovereignty" in the new territory.
The correct answer is "It was the 1st time England had interfered with American policy and economics."
The impact of the Navigation Acts was that it was the 1st time England had interfered with American policy and economics.
The English crown imposed heavy taxation on the colonies, trying to get more money due to the many debts the British government had for the many wars and battles it participated in.
In 1642, and due to the Civil War in England, the North American colonies established trade relations with the French and Dutch. But in 1651, the British Parliament ordered that the colonies only could export their goods to Great Britain. Of course, this upset and angered the colonists, and from there on, a series of heavy taxation on the colonies followed. We are talking about the Stamp Act, the Wool Act, the Intolerable Acts, the Stamp Act, and the Sugar Act.
