north
15 degrees West of true North.
Departing Texas you would travel north to reach South Dakota.
North
You would travel due north.
Due north.
the direction is north.
15° West of true North.
To travel from the US state of South Dakota to Oklahoma, you would travel south.
South Dakota to Canada
South Dakota to Canada
Since South Dakota is directly north of Kansas, you would travel north.
Departing South Dakota you would travel southeast to reach North Carolina.
If you actually could travel by car to India from South Dakota, that would be the longest distance to travel. However, you would need to find alternate means to travel across the ocean.