The Amasia model is the most simple of them all. It has continents all converging around the North Pole, while Antarctica remains at the South Pole. By 50 Million years, the Arctic Ocean has closed. By 100 Million Years, Australia collides with southern Siberia and North America. By 150 Million years, South America has rotated clockwise around America, closing the Gulf of Mexico. By 200 Million years, North and South America, Africa, Australia, Europe and Asia have all merged at the North Pole, with Antarctica remaining at the South Pole.

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This is the last supercontinent that could happen. There is an alternate version of this continent that I hadn't included because it's quite unlikely. Here it is: https://pbs.twimg.com/media/DwaTg55UwAACXSN.jpg