The two parts of the continent start to move away from each other
causing rifting of the continental plate, the center or the rift becomes thinner, weaker and starts to sag. The basin area in the middle which has sagged is usually filled up with water, forming a sea. (e.g. the red sea)
The thinner plate in the center then becomes oceanic crust from this, and in the center a new constructive plate boundary is formed. <span>The plates continue to move apart from one another and magma erupts from the constructive/divergent plate boundary, producing new oceanic crust formed mainly of basalt.</span>
He was originally negotiating with for access to the mouth of the Mississippi River in New Orleans. France was low on money at the time, and in need of a lot of money to fund more of Napoleon's battles - so France offered their ENTIRE Louisiana Territory instead of just New Orleans for only three cents an acre