帮忙写英语作文呀。~

The United States of America is a constitutional federal republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to its east and Russia to the west across the Bering Strait, and the state of Hawaii is in the mid-Pacific. The United States also possesses several territories, or insular areas, scattered around the Caribbean and Pacific.

At 9.83 million km² and with about 230 million people, the United States is the third or fourth largest country by total area, and third largest by land area and by population.

5.美国和中国的关系，，，这个你自己发挥一下吧

还有阿，美国人口早超过3亿了，你那是什么时候的数据阿？