United States

The adjoining center of the United States is a huge inland lowland, from ancient shields in northern Canada to the southern Gulf of Mexico. In the east and the west, this lowland gradually rises gradually and then suddenly from both sides to a mountain separated from the sea. The two mountain systems are very different. The Appalachian mountain ranges in the east are low, almost no breaks behind the Atlantic Ocean. From New York to the Mexican border, low coastal plains extend along wetlands, and winding coasts face the ocean. The gently sloping surface of the plain extends to the bottom of the ocean and forms a continental shelf. The continental shelf is sinking under shallow sea water, but it is geologically the same as the coastal plain. Swing west in Georgia and Alabama, cut off the Appalachia mountain range along the southern tip, cut off inland lowlands from the bay and spread to South Plains

The western central lowland is a powerful Cordillera mountain range, which is part of the worldwide mountain system surrounding the Pacific Basin. Cordillera occupies one-third of the United States, its internal variety is about the same size. Located at the eastern end of the Rocky Mountains is a very diverse and discontinuous chain from New Mexico to the Canadian border. The western end of Cordillera is a rugged mountain range and inland valley of the Pacific coast, and the whole sea is excitingly wonderful without receiving the benefits of the coast plain. The peak between the Rocky Mountains and the Pacific Chain is a huge, mountainous complex basin, plateaus and isolated mountains deserving to be regarded as different from Cordillera itself.

These regions - the inland lowlands and the rims of the highlands, the Appalachian mountains, the Atlantic plains, the western Cordillera and the western mountains - are diverse and need to be further divided into 24 major subregions or provinces.

There are New England, Mid Atlantic, Southern United States, Midwestern USA, West of America, etc. in the semi-intercultural region of the United States, and it can be further divided into Pacific countries and mountainous countries based on regional culture. Because of conservative evangelical Protestantism, the southern US is informally called the "Bible Belt" which is an important part of the culture of this region. This area is in contrast to the mainstream Protestant and Catholic in the northeastern United States, religiously diverse of the Midwest and the Great Lakes, the Mormonism corridors of Utah and southern Idaho, and the relatively mundane American West is.

The Bible band is an informal term in a certain region of the southern United States, socially conservative evangelical Protestantism is an important part of culture, Christian sectons attend more than the average nation average I will. In contrast, religion does not play the most important role in New England and the West of the United States. The pregnancy rate of American teenagers is 26.5 people per 1,000 females. Since 1991, this ratio has dropped by 57%. In 2013, the highest birth rate among young people was Alabama State and Wyoming State was the lowest. Roe v, a groundbreaking decision made by the US Supreme Court in 1973. Because of Wade, abortion is legal throughout the United States. At the same time as the abortion rate drops, the abortion rate is 241 per 1,000 live births, 15 people per 1,000 women aged 15 to 44, still higher than most Western countries. The average birth age in 2013 is 26 years old, 40.6% of unmarried women were born.