The Earth's axis of rotation is tilted, which means that as the Earth orbits the sun, different parts of the planet receive more or less sunlight at different times of year. This is why we have seasons. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice versa.
The US is located in the Northern Hemisphere, and Asia is located in the Eastern Hemisphere. When it is summer in the US, the days are longer and the sun is higher in the sky. This means that there is more sunlight available to the US during the day, and less sunlight available to Asia during the night.
As the Earth rotates, the US moves away from the sun and Asia moves towards the sun. This means that the sun sets in the US and rises in Asia. When it is daytime in the US, it is nighttime in Asia, and vice versa.
