Napoleon Bonaparte had decided to sell the Louisiana territory to US as he was money strapped due to war with Great Britain. Haitian revolution and British naval blockade also compelled the french to offer this territory to the US. President Thomas Jefferson sent James Monroe to help Livingstone in 1803 to negotiate for new Orleans and some part of Florida as he wanted US to stretch across entire continent. Livingstone and Monroe signed Louisiana purchase treaty on April 30, 1803 and paid 15 million dollars.
The policy of 'Salutary Neglect' lasted from the early 1600's to the 1760's and avoided strict enforcement of parliamentary laws - British officials in the colonies were basically allowed to turn a 'blind eye' to trade violations - they neglected to enforce the law.
