U.S. study
The United States is a federal republic constitutional country composed of 50 states and Washington, D.C. as its capital. The total population exceeds 310 million, and the main regions are divided into: Southeast Region, Central Pacific Region, Southwest Region, North Pacific Region, Midwest Region, Hawaii, Northern Region and Alaska.
The climate of the United States varies from region to region.
Summer: about 12°C - 32°C
Winter: about minus 12°C - 16°C
New York on the east coast is 12-13 hours behind Hong Kong, Chicago in the middle is 13-14 hours behind Hong Kong, and San Francisco on the west coast is 15-16 hours behind Hong Kong.