Oklahoma, Sooner or Later

The shapes look a bit like Oklahoma if you’re generous, and because people who illegally rushed in to claim land ahead of the official opening of the legal theft of Oklahoma land in 1889 were labeled “Sooners,” a name the University of Oklahoma adopted for all future sports teams in 1908.

I spend all my creativity on the puzzles, leaving nothing for the names.

Rules:
Normal Irregular Sudoku rules apply. (There are nine regions of nine cells each, but they are not 3x3 squares.)
Digits do not repeat in cells a chess knight’s move apart.
Cells separated by a white dot contain consecutive digits. In cells separated by a black dot, one digit is double the other. Not all possible dots are given.

Estimated difficulty: 1.5 out of 5