We know that Thomas Jefferson made the Louisiana Purchase in 1803 for $15 million, which doubled the size of the United States, but I'm curios to know.. Was Jefferson initally afraid to make the purchase because he was afraid that doing so would cause a war with France?

Good place to start your research: Louisiana Purchase - Wikipedia, the free encyclopedia

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Who owned the Louisiana territory before the US did? What was going on between Spain and France? Why was there a possibility of war with France? What did Jefferson do to prevent war? What resulted from his decision?

Its just idle curiosity. I recently watched a documentary on Thomas Jefferson and I'm interested in learning more about him. France previously owned the Louisiana territory.

The sale of the territory by Spain back to France in 1800. I think that there was a possibility of war over the fear of an eventual French invasion spread nationwide when, in 1801, Napoleon sent a military force to secure New Orleans. The war was prevented by The Treaty of Louisiana

Thomas Jefferson lived in France for a period of his life; he did not want to jeopardize his accumulation of land for the US by alienating the French who he considered to be a good trade resource and a strong allie. By the way, France and Spain were always at war.