Here's why:
* Efficiency: Launching a spacecraft into a prograde orbit requires less fuel and energy than launching it against the Earth's rotation.
* Orbital Stability: A prograde orbit allows the ISS to take advantage of Earth's natural rotation, making it easier to maintain its orbit over time.
The ISS orbits at an inclination of 51.6 degrees, meaning its orbit is tilted relative to the equator. However, it still orbits in the same direction as the Earth's spin.