The USA is composed of 50 states. It occupies the central part of North American continent. It borders on Canada in the north and on Mexico in the south.he area of the USA is over nine million square kilometres. It is washed by the Pacific Ocean and by the Atlantic Ocean. As the USA is a large country, the climate is different in different regions. For example, the Pacific coast is a region of mild winters and warm, dry summers, but the eastern continental region is watered with rainfall. The region arounc the Great Lakes has changeable weather. There are many big cities in the coun try. They are Washington (the capital of the country). New York , Boston , Chicago , San Francisco, Los Angeles, Philadelphia, Detroit. There are some holidays we celebrate that are not federal holidays but are very popular holidays to celebrate.