The two sentences which describes the effects of the Louisiana purchase:
The purchase of Louisiana by the united states led to the expansion of the size of the united states and also granting the united states access to the Mississippi river which runs from Minnesota to Louisiana.
The size of the united states doubled which led to the provision of vast farm areas.
Hence we can conclude that the purchase of Louisiana led to the The size of the united states doubled, providing vast areas for farming and The united states permanently gained free access to the mississippi river.
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